[PHP] Re: Random Flash Movies
As always, thanks for your help.
Gary
""Gary"" wrote in message
news:68.43.09009.cba46...@pb1.pair.com...
>A question was posted on another board that the poster wanted random flash
>movies to display as the page is reloaded. I posted the script below and
>said I thought it could be adapted but that the echo would probably need to
>change. Can someone offer some guidance on this? Thanks
>
> Gary
>
> //Chooses a random number
> $num = Rand (1,6);
> //Based on the random number, gives a quote
> switch ($num)
> {
> case 1:
> echo "";
> break;
> case 2:
> echo "";
> break;
> case 3:
> echo "";
> break;
> case 4:
> echo "";
> break;
> case 5:
> echo "";
> break;
> case 6:
> echo "";
> }
> ?>
>
>
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>
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> __ Information from ESET Smart Security, version of virus
> signature database 4442 (20090921) __
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> The message was checked by ESET Smart Security.
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Re: [PHP] Re: Random Unique ID
On Wed, March 21, 2007 5:40 pm, [EMAIL PROTECTED] wrote:
> Thanks. Yes, I check for errors. But there are other types of errors
> so I'd need to verify that it is a duplicate key error and, in my
> ignorance, I have not yet figured out how to do that programatically.
> I worry about getting into an infinite loop.
Untested code:
//create table test_id (id char(32) unique not null primary key));
$success = 0;
while (!$success){
$id = md5(uniqid());
$query = "insert into test_id (id) values('$id')";
$result = mysql_query($query);
if (!$result){
//I don't promise 1023 is right.
//force a duplicate as a test to confirm
if (mysql_errno() == 1023){
//duplicate key
//we'll loop back and try with another
}
else{
echo "Something went wrong with our database. Sorry.";
error_log(mysql_error());
break;
}
}
else{
$success = 1;
}
}
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Re: [PHP] Re: Random Unique ID
I'm sorry if I am repeating something that has been said, but in the comments to: http://es2.php.net/manual/en/function.uniqid.php there is a little piece of code that generates UUID as per RFC 4122, and those get as unique as they come. MySql has a UUID() function and so do any database engine that supports replication, since that's the only way to ensure keys won't get repeated over multiple servers. Satyam - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Friday, March 23, 2007 7:48 PM Subject: [PHP] Re: Random Unique ID Robert Cummings writes: Bleh, you can solve this with at most 2 queries. Thanks. That is a bit different than what I was thinking about but it might work for my purposes. Thanks also to all the other people who made suggestions. It appears to me that ther are 3 distinct approaches. 1) Generate a random number. Query the DB to see if it has been used before and if so generate another random number and repeat. It seems to me that this would require that the DB be locked for the checking and insertion to make sure a duplicate was not slipped in. 2) Generate a random number. Make a trial insertion for a unique field. If the insertion fails repeat. This functions just like the above but uses Mysql's native behavior to handle the checking so no user locking is necessary. Almost all the time this will require only 1 insertion whereas the above will require 2 or more accesses. 3) Generate a unique identifier from the record sequence number. Since the sequence number is guaranteed to be unique the identifier will also be unique and can be used without any worry. There are various schemes I can think of by which the unique identifier, altho uniquely determined by the sequence number, can be generated so that it will not reveal the sequence number and appear unpredictable. This will require 3 accesses to the DB (insertion, mysql_insert_id, and update). I have a number of options to try and think about. Thanks again. Best, Craig -- - Virtual Phonecards - Instant Pin by Email - - Large Selection - Great Rates- - http://speedypin.com/?aff=743&co_branded=1 - -- ** ** * Craig Spencer * * [EMAIL PROTECTED]* ** ** -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.17/730 - Release Date: 22/03/2007 7:44 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Unique ID
Robert Cummings writes: Bleh, you can solve this with at most 2 queries. Thanks. That is a bit different than what I was thinking about but it might work for my purposes. Thanks also to all the other people who made suggestions. It appears to me that ther are 3 distinct approaches. 1) Generate a random number. Query the DB to see if it has been used before and if so generate another random number and repeat. It seems to me that this would require that the DB be locked for the checking and insertion to make sure a duplicate was not slipped in. 2) Generate a random number. Make a trial insertion for a unique field. If the insertion fails repeat. This functions just like the above but uses Mysql's native behavior to handle the checking so no user locking is necessary. Almost all the time this will require only 1 insertion whereas the above will require 2 or more accesses. 3) Generate a unique identifier from the record sequence number. Since the sequence number is guaranteed to be unique the identifier will also be unique and can be used without any worry. There are various schemes I can think of by which the unique identifier, altho uniquely determined by the sequence number, can be generated so that it will not reveal the sequence number and appear unpredictable. This will require 3 accesses to the DB (insertion, mysql_insert_id, and update). I have a number of options to try and think about. Thanks again. Best, Craig -- - Virtual Phonecards - Instant Pin by Email - - Large Selection - Great Rates- - http://speedypin.com/?aff=743&co_branded=1 - -- ** ** * Craig Spencer * * [EMAIL PROTECTED]* ** ** -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Unique ID
[EMAIL PROTECTED] wrote: > Hello, > > I want to add a random unique ID to a Mysql table. Collisions > are unlikely but possible so to handle those cases I'd like to > regenerate the random ID until there is no collision and only > then add my row. Any suggestions for a newbie as to the right > way to go about doing this? > > Best, > > Craig > I just wrote up a quick PHP extension that will do what you want. It is on my website, it is called muniqid, you can get it from the download area. You can build it as part of PHP or used phpize, configure, make, make install and create a module. get it at http://ww.mohawksoft.org It provides two functions: muniqid_time(), and muniqid_rand(). muniqid_time() creates a GUID looking string that incorporates, time in seconds, timer ticks, pid, ip address, and system stats to create an almost certainly unique key with enough random data to make it impossible to guess. A duplicate is only possible within your web site (I guess it could happen somewhere in the world), if you are using SMP motherboards and both processors are processing a create ID, at *exactly* the same time (within resolution of clock ticks) and are running in two threads within the same process and rand() is isolated between threads and both threads have processed the same number of IDs. Short of that, pretty impossible. muniqid_rand() creates a GUID looking string that incorporates a lot of random data from your machine. It may be less unique than muniqid_time, but is far more random. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Re: Random Unique ID
Tijnema ! wrote:
> On 3/22/07, markw@mohawksoft.com wrote:
>> > On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
>> >> # markw@mohawksoft.com / 2007-03-22 08:49:59 -0400:
>> >> > Tijnema ! wrote:
>> >> >
>> >> > > On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
>> >> > >>
>> >> > >> http://www.ossp.org/pkg/lib/uuid
>> >> > >
>> >> > > Note that this doesn't gonna work when safe mode is on..!
>> >>
>> >> Ralf S. Engelschall's OSSP UUID library wrapped in a PHP extension
>> >> (shipped with the library) won't work in safe mode? How's that?
>> >
>> > I quote the wrong guy i think, i meant to quote this
>> >> If you are running Linux, you can get this using:
>> >>$GUID = exec("uuidgen");
>> > As this is using the exec function, which doesn't work with safe mode
>> > on.
>> >
>> >
>> >>
>> >> > Generating a psudo-random unique key doesn't seem to be something
>> >> > PHP
>> >> does
>> >> > well. I can post an extension this afternoon if anyone wants to use
>> >> it.
>> >>
>> >> I'm curious.
>> >>
>>
>> Take a hop over to www.mohawksoft.org, and check out "download," download
>> MUniqID and tell me what you think.
>>
>> It should build as a module.
>>
>>
> I'm not sure where you want to use it for, but keep in mind that if
> you are gonna use external modules/applications it will probably work
> only on your development server. Not everyone (nearly nobody) has such
> modules installed, so if you are planning to distribute, you need to
> keep in mind that everyone that want's to use the script, will need to
> install the used module/app.
Well, it can build as part of PHP if you do a buildconf as well
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Re: [PHP] Re: Random Unique ID
On 3/22/07, markw@mohawksoft.com wrote:
> On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
>> # markw@mohawksoft.com / 2007-03-22 08:49:59 -0400:
>> > Tijnema ! wrote:
>> >
>> > > On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
>> > >>
>> > >> http://www.ossp.org/pkg/lib/uuid
>> > >
>> > > Note that this doesn't gonna work when safe mode is on..!
>>
>> Ralf S. Engelschall's OSSP UUID library wrapped in a PHP extension
>> (shipped with the library) won't work in safe mode? How's that?
>
> I quote the wrong guy i think, i meant to quote this
>> If you are running Linux, you can get this using:
>>$GUID = exec("uuidgen");
> As this is using the exec function, which doesn't work with safe mode on.
>
>
>>
>> > Generating a psudo-random unique key doesn't seem to be something PHP
>> does
>> > well. I can post an extension this afternoon if anyone wants to use
>> it.
>>
>> I'm curious.
>>
Take a hop over to www.mohawksoft.org, and check out "download," download
MUniqID and tell me what you think.
It should build as a module.
I'm not sure where you want to use it for, but keep in mind that if
you are gonna use external modules/applications it will probably work
only on your development server. Not everyone (nearly nobody) has such
modules installed, so if you are planning to distribute, you need to
keep in mind that everyone that want's to use the script, will need to
install the used module/app.
Tijnema
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Re: [PHP] Re: Random Unique ID
> On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
>> # markw@mohawksoft.com / 2007-03-22 08:49:59 -0400:
>> > Tijnema ! wrote:
>> >
>> > > On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
>> > >>
>> > >> http://www.ossp.org/pkg/lib/uuid
>> > >
>> > > Note that this doesn't gonna work when safe mode is on..!
>>
>> Ralf S. Engelschall's OSSP UUID library wrapped in a PHP extension
>> (shipped with the library) won't work in safe mode? How's that?
>
> I quote the wrong guy i think, i meant to quote this
>> If you are running Linux, you can get this using:
>>$GUID = exec("uuidgen");
> As this is using the exec function, which doesn't work with safe mode on.
>
>
>>
>> > Generating a psudo-random unique key doesn't seem to be something PHP
>> does
>> > well. I can post an extension this afternoon if anyone wants to use
>> it.
>>
>> I'm curious.
>>
Take a hop over to www.mohawksoft.org, and check out "download," download
MUniqID and tell me what you think.
It should build as a module.
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Re: [PHP] Re: Random Unique ID
On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
# markw@mohawksoft.com / 2007-03-22 08:49:59 -0400:
> Tijnema ! wrote:
>
> > On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
> >>
> >> http://www.ossp.org/pkg/lib/uuid
> >
> > Note that this doesn't gonna work when safe mode is on..!
Ralf S. Engelschall's OSSP UUID library wrapped in a PHP extension
(shipped with the library) won't work in safe mode? How's that?
I quote the wrong guy i think, i meant to quote this
If you are running Linux, you can get this using:
$GUID = exec("uuidgen");
As this is using the exec function, which doesn't work with safe mode on.
> Generating a psudo-random unique key doesn't seem to be something PHP does
> well. I can post an extension this afternoon if anyone wants to use it.
I'm curious.
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Re: [PHP] Re: Random Unique ID
# markw@mohawksoft.com / 2007-03-22 08:49:59 -0400: > Tijnema ! wrote: > > > On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote: > >> > >> http://www.ossp.org/pkg/lib/uuid > > > > Note that this doesn't gonna work when safe mode is on..! Ralf S. Engelschall's OSSP UUID library wrapped in a PHP extension (shipped with the library) won't work in safe mode? How's that? > Generating a psudo-random unique key doesn't seem to be something PHP does > well. I can post an extension this afternoon if anyone wants to use it. I'm curious. -- How many Vietnam vets does it take to screw in a light bulb? You don't know, man. You don't KNOW. Cause you weren't THERE. http://bash.org/?255991 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Re: Random Unique ID
Tijnema ! wrote:
> On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
>> # [EMAIL PROTECTED] / 2007-03-21 21:03:35 -0500:
>> > Mark wrote:
>> > >[EMAIL PROTECTED] wrote:
>> > >
>> > >>Hello,
>> > >>
>> > >>I want to add a random unique ID to a Mysql table. Collisions
>> > >>are unlikely but possible so to handle those cases I'd like to
>> > >>regenerate the random ID until there is no collision and only
>> > >>then add my row. Any suggestions for a newbie as to the right
>> > >>way to go about doing this?
>> > >>
>> > >>Best,
>> > >>
>> > >>Craig
>> > >.
>> > >
>> > >I suggest looking into a GUID sort of thing, it is all coded for you
>> > >and it works just like you want.
>> >
>> > If you are running Linux, you can get this using:
>> >$GUID = exec("uuidgen");
>>
>> http://www.ossp.org/pkg/lib/uuid
>
> Note that this doesn't gonna work when safe mode is on..!
Generating a psudo-random unique key doesn't seem to be something PHP does
well. I can post an extension this afternoon if anyone wants to use it.
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Re: [PHP] Re: Random Unique ID
On 3/22/07, Roman Neuhauser <[EMAIL PROTECTED]> wrote:
# [EMAIL PROTECTED] / 2007-03-21 21:03:35 -0500:
> Mark wrote:
> >[EMAIL PROTECTED] wrote:
> >
> >>Hello,
> >>
> >>I want to add a random unique ID to a Mysql table. Collisions
> >>are unlikely but possible so to handle those cases I'd like to
> >>regenerate the random ID until there is no collision and only
> >>then add my row. Any suggestions for a newbie as to the right
> >>way to go about doing this?
> >>
> >>Best,
> >>
> >>Craig
> >.
> >
> >I suggest looking into a GUID sort of thing, it is all coded for you and it
> >works just like you want.
>
> If you are running Linux, you can get this using:
>$GUID = exec("uuidgen");
http://www.ossp.org/pkg/lib/uuid
Note that this doesn't gonna work when safe mode is on..!
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Re: [PHP] Re: Random Unique ID
# [EMAIL PROTECTED] / 2007-03-21 21:03:35 -0500:
> Mark wrote:
> >[EMAIL PROTECTED] wrote:
> >
> >>Hello,
> >>
> >>I want to add a random unique ID to a Mysql table. Collisions
> >>are unlikely but possible so to handle those cases I'd like to
> >>regenerate the random ID until there is no collision and only
> >>then add my row. Any suggestions for a newbie as to the right
> >>way to go about doing this?
> >>
> >>Best,
> >>
> >>Craig
> >.
> >
> >I suggest looking into a GUID sort of thing, it is all coded for you and it
> >works just like you want.
>
> If you are running Linux, you can get this using:
>$GUID = exec("uuidgen");
http://www.ossp.org/pkg/lib/uuid
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Re: [PHP] Re: Random Unique ID
On Thu, 2007-03-22 at 08:14 +0400, Rabih Tayyem wrote: > Actually I told you that the possibility of collision is small because I > wanted to be scientific > Scientifically, I can say this posibilty goes to 0... Only as the length of the ID approaches infinity :B Cheers, Rob. -- .. | InterJinn Application Framework - http://www.interjinn.com | :: | An application and templating framework for PHP. Boasting | | a powerful, scalable system for accessing system services | | such as forms, properties, sessions, and caches. InterJinn | | also provides an extremely flexible architecture for | | creating re-usable components quickly and easily. | `' -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Re: Random Unique ID
Actually I told you that the possibility of collision is small because I wanted to be scientific Scientifically, I can say this posibilty goes to 0... It is a random ID (not a totally random but based on the current timestamp) generated not only once but twice based on two different time stamps. Safe enough I believe... Regards, Rabih G. Tayyem On 3/22/07, Jim Moseby <[EMAIL PROTECTED]> wrote: > Rabih Tayyem writes: > > > PS: I don't take credit for the code as it is a modified version of > > a code I found long time back (this same code is running on one of > > my applications for months without any problem).. > > Thanks. I'll find use for that! > > However, altho I know that by making the random number big enough > the likelyhood of collisions can be made vanishingly small, I was > actually concerned with eliminating the possibility of collisions > altogether by checking to see if the number had been used before. > > I just don't know how to do that properly with Mysql. Perhaps it > is necessary to lock to table, check, make the insert and then > unlock it. But I was hoping that there would be a simpler way. Replied off-list with a solution. JM -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Unique ID
Mark wrote:
[EMAIL PROTECTED] wrote:
Hello,
I want to add a random unique ID to a Mysql table. Collisions
are unlikely but possible so to handle those cases I'd like to
regenerate the random ID until there is no collision and only
then add my row. Any suggestions for a newbie as to the right
way to go about doing this?
Best,
Craig
.
I suggest looking into a GUID sort of thing, it is all coded for you and it
works just like you want.
If you are running Linux, you can get this using:
$GUID = exec("uuidgen");
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[PHP] Re: Random Unique ID
[EMAIL PROTECTED] wrote: > Hello, > > I want to add a random unique ID to a Mysql table. Collisions > are unlikely but possible so to handle those cases I'd like to > regenerate the random ID until there is no collision and only > then add my row. Any suggestions for a newbie as to the right > way to go about doing this? > > Best, > > Craig First some computer science 101: A random number is not unique and a unique number is not random. Learn it, know it, live it. What you need is a component of the ID which is not random, but is probably unique within the environment. Say, the IP address of the machine. Then, perhaps the process id of Apache/PHP process. Then, the random component, the time() (which is random with respect to the request, but unique for one second), followed by some rand() requests seeded by some high resolution micro timer. This will have a HUGH probability of uniqueness within the single process, so it is virtually assured, and a guarantee of uniqueness across all other processes and machines. I suggest looking into a GUID sort of thing, it is all coded for you and it works just like you want. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Re: Random Unique ID
On Wed, 2007-03-21 at 16:40 -0600, [EMAIL PROTECTED] wrote: > Jim Moseby writes: > > >> However, altho I know that by making the random number big enough > >> the likelyhood of collisions can be made vanishingly small, I was > >> actually concerned with eliminating the possibility of collisions > >> altogether by checking to see if the number had been used before. > >> > >> I just don't know how to do that properly with Mysql. Perhaps it > >> is necessary to lock to table, check, make the insert and then > >> unlock it. But I was hoping that there would be a simpler way. > > > > One way is to make your id field a unique key. MySQL will not let > > you insert a record with a duplicate unique key, and will issue an > > error. Your code should always check for errors on insert anyway, > > so if you get an error, generate a new key and try again. > > Thanks. Yes, I check for errors. But there are other types of errors > so I'd need to verify that it is a duplicate key error and, in my > ignorance, I have not yet figured out how to do that programatically. > I worry about getting into an infinite loop. Bleh, you can solve this with at most 2 queries. CREATE TABLE foo ( id INT NOT NULL AUTO_INCREMENT, uid char( 50 ), PRIMARY KEY ( id ) ); There you go, a 50 character highly unguessable and guaranteed unique ID. Sure everyone knows the ID of the entry now, but that shouldn't be important. In fact it optimizes retrieval and validation by allowing the lookup to occur on an integer then validation by matching the full UID against the UID found for the ID. In all honesty though, hitting the database with random generated md5() hashes is probably more efficient since the likelihood of a collision is small and so in most cases you will only make one database query. Cheers, Rob. -- .. | InterJinn Application Framework - http://www.interjinn.com | :: | An application and templating framework for PHP. Boasting | | a powerful, scalable system for accessing system services | | such as forms, properties, sessions, and caches. InterJinn | | also provides an extremely flexible architecture for | | creating re-usable components quickly and easily. | `' -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Unique ID
Jim Moseby writes: However, altho I know that by making the random number big enough the likelyhood of collisions can be made vanishingly small, I was actually concerned with eliminating the possibility of collisions altogether by checking to see if the number had been used before. I just don't know how to do that properly with Mysql. Perhaps it is necessary to lock to table, check, make the insert and then unlock it. But I was hoping that there would be a simpler way. One way is to make your id field a unique key. MySQL will not let you insert a record with a duplicate unique key, and will issue an error. Your code should always check for errors on insert anyway, so if you get an error, generate a new key and try again. Thanks. Yes, I check for errors. But there are other types of errors so I'd need to verify that it is a duplicate key error and, in my ignorance, I have not yet figured out how to do that programatically. I worry about getting into an infinite loop. Best, Craig -- - Virtual Phonecards - Instant Pin by Email - - Large Selection - Great Rates- - http://speedypin.com/?aff=743&co_branded=1 - -- ** ** * Craig Spencer * * [EMAIL PROTECTED]* ** ** -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Re: Random Unique ID
[EMAIL PROTECTED] wrote: Stut writes: [EMAIL PROTECTED] wrote: I want to add a random unique ID to a Mysql table. Collisions are unlikely but possible so to handle those cases I'd like to regenerate the random ID until there is no collision and only then add my row. Any suggestions for a newbie as to the right way to go about doing this? 1) Not even slightly PHP related. Perhaps not. It is Mysql related. And seeing other Mysql discussion on this list inspired me to ask. I refer you to the comment made earlier today by one of my honourable colleagues regarding murder. 2) Why random? Incrementing not good enough for you? I want to use it in a way that will expose it to the user. And I don't want to give out information as to the order of records in my database. This is not security. Your site should prevent them from accessing data they should not be accessing. If you're worried that they can do this simply by changing a number in a query string then you really need to rethink the way the site works. If you decide to ignore my advice, then the only way to do this is to set the ID field as unique, pick a random number and try to insert the row. Repeat until the insert succeeds. Yes it sucks, but so does what you are trying to do. -Stut -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Re: Random Unique ID
> Rabih Tayyem writes: > > > PS: I don't take credit for the code as it is a modified version of > > a code I found long time back (this same code is running on one of > > my applications for months without any problem).. > > Thanks. I'll find use for that! > > However, altho I know that by making the random number big enough > the likelyhood of collisions can be made vanishingly small, I was > actually concerned with eliminating the possibility of collisions > altogether by checking to see if the number had been used before. > > I just don't know how to do that properly with Mysql. Perhaps it > is necessary to lock to table, check, make the insert and then > unlock it. But I was hoping that there would be a simpler way. Replied off-list with a solution. JM -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Unique ID
Rabih Tayyem writes: PS: I don't take credit for the code as it is a modified version of a code I found long time back (this same code is running on one of my applications for months without any problem).. Thanks. I'll find use for that! However, altho I know that by making the random number big enough the likelyhood of collisions can be made vanishingly small, I was actually concerned with eliminating the possibility of collisions altogether by checking to see if the number had been used before. I just don't know how to do that properly with Mysql. Perhaps it is necessary to lock to table, check, make the insert and then unlock it. But I was hoping that there would be a simpler way. Best, Craig On 3/21/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: Hello, I want to add a random unique ID to a Mysql table. Collisions are unlikely but possible so to handle those cases I'd like to regenerate the random ID until there is no collision and only then add my row. Any suggestions for a newbie as to the right way to go about doing this? Best, Craig -- - Virtual Phonecards - Instant Pin by Email - - Large Selection - Great Rates- - http://speedypin.com/?aff=743&co_branded=1 - -- ** ** * Craig Spencer * * [EMAIL PROTECTED]* ** ** -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- - Virtual Phonecards - Instant Pin by Email - - Large Selection - Great Rates- - http://speedypin.com/?aff=743&co_branded=1 - -- ** ** * Craig Spencer * * [EMAIL PROTECTED]* ** ** -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Unique ID
Stut writes: [EMAIL PROTECTED] wrote: I want to add a random unique ID to a Mysql table. Collisions are unlikely but possible so to handle those cases I'd like to regenerate the random ID until there is no collision and only then add my row. Any suggestions for a newbie as to the right way to go about doing this? 1) Not even slightly PHP related. Perhaps not. It is Mysql related. And seeing other Mysql discussion on this list inspired me to ask. 2) Why random? Incrementing not good enough for you? I want to use it in a way that will expose it to the user. And I don't want to give out information as to the order of records in my database. Best, Craig -- - Virtual Phonecards - Instant Pin by Email - - Large Selection - Great Rates- - http://speedypin.com/?aff=743&co_branded=1 - -- ** ** * Craig Spencer * * [EMAIL PROTECTED]* ** ** -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Record Retrieval
[EMAIL PROTECTED] (Robb Kerr) writes: > How's that for alliteration in a subject line? Very nice! :-) > [...] And, if this is the best way to go, unfortunately I don't > know how to write a random number generator in PHP so would > appreciate any help. Your idea sounds good, and luckily you don't have to build your own random generator, behold: http://php.net/rand Then call rand() with two arguments: the minimum and maximum ID, and it will give you a random integer back between those two numbers. You could also opt to have MySQL make the random number for you, and then do a query like SELECT * FROM table ORDER BY RAND() LIMIT 1; Then you wont have to deal with figuring out the number of rows in the table as you would in the PHP case. You can also increse the limit to, say, 3 and then show three random quotes on your pages. See http://dev.mysql.com/doc/mysql/en/Mathematical_functions.html#IDX1363 for a description of RAND() in MySQL. -- Martin Geisler My GnuPG Key: 0xF7F6B57B PHP EXIF Library | PhpWeather | PhpShell http://pel.sf.net/| http://phpweather.net/ | http://gimpster.com/ Read/write EXIF data | Show current weather| A shell in a browser -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: random?
"Chris" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> $sql = "SELECT * FROM agentdb WHERE ((OfficeID <> 214) and
> (agentdb.agent_id<> 1115421) and (agentdb.agent_id > 100) and
> agentdb.agent_id <> 333)) ORDER BY RAND() LIMIT 1";
>
> The above code should generate a random agent upon refresh.
>
> It does however seem to favor one agent more than the others. The agent id
>
> it used to favor was "333" i added the "(agentdb.agent_id <> 333)" to
>
> disallow that agent from being displayed. But now it wants to favor an
agent
>
> whose id number is "1167553"
>
> The function can be seen here: http://c21alliancerealty.com/area.php it is
>
> the random "Featured Agent" on the left hand side of the page.
>
> Does anyone have any suggestions as to why this is occuring, please?
I don't have any suggestions as to why this happens. Very strange. One
thing you could do instead is depend on PHP's random numbers.
srand ((double) microtime() * 100);
$r = mysql_query('select count(*) as cnt from agentb');
$cnt = mysql_result($r, 0, 0);
mysql_free_result($r);
$rnd = rand(1, $cnt);
$sql = "SELECT * FROM agentdb WHERE ((OfficeID <> 214) and
(agentdb.agent_id<> 1115421) and (agentdb.agent_id > 100) and
agentdb.agent_id <> 333)) LIMIT $rnd, 1";
A bit more work than just relying on MySQL, but maybe it will actually be
random...
-- Rob
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Re: [PHP] Re: Random Numbers..
* Thus wrote Burrito Warrior ([EMAIL PROTECTED]): > > This would: > /* selecting a random record, where n = 1. Works fine on small tables */ > mysql> SELECT value FROM table ORDER BY RAND() LIMIT n; > > /* selecting a random record. This is good on large tables if numbering > sequence is used */ > mysql> SET @val = FLOOR(RAND() * n) + 1; > mysql> SELECT value FROM table WHERE ID = @val; If two queries is acceptable: select a count() on a unique/primary key, it should minimal overhead since the value is obtained very quickly with those columns. then do a limit... SELECT FLOOR(RAND() * COUNT(id)) + 1 as n FROM table; SELECT value FROM table LIMIT n, 1 return 1 record starting to the nth record. There still lies the performance loss the larger n becomes. Or using the ID method: SELECT FLOOR(RAND() * MAX(id)) + 1 as n FROM table; SELECT value FROM table id >= n LIMIT 1 This might be the optimal in the two query method. Since it will use the index to seek id >= n. Curt -- If eval() is the answer, you're almost certainly asking the wrong question. -- Rasmus Lerdorf, BDFL of PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Numbers..
select all and use mysql_data_seek($result, rand(mysql_num_rows($result) - 1)); $row = mysql_fetch_assoc($result); and there, your random row is returnd, that should be easy enough :) and it should work -- Luke "Theheadsage" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Hey, > > I've got a script which used to generate a random quote. It worked fine > untill this problem occurred.. > > Say we have 4 quotes with QuoteID's of 1 through to 4 > The script would grab a number of rows, and generate a random number > between 1 and this value (being 4 in this case) This worked fine untill, > one of the quotes was removed and another added, leaving 4 quotes once > again, but the last one had an ID of 5. The problem is the Random number > generated is between 1 and 4, so the final quote is never shown.. > > I tried using the RAND() function in the MySQL statement it's self, but > it's not random enough... > > Then I thought of doing this: > > Select all the Quote ID's from the DB. > Store them in an Array. > Generate a random number between 1 and the last ID. > If the Random Number matches a Quote ID, then display the quote, > otherwise Generate another > > But I couldn't get the code to work. Any suggestions on either how to > write the above, or made the MySQL RAND() function, more random? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Re: Random Numbers..
No, I wouldn't do that. What if another quote gets deleted. The new assigned QuoteID would be 6 and your solution wouldn't work. This would: /* selecting a random record, where n = 1. Works fine on small tables */ mysql> SELECT value FROM table ORDER BY RAND() LIMIT n; /* selecting a random record. This is good on large tables if numbering sequence is used */ mysql> SET @val = FLOOR(RAND() * n) + 1; mysql> SELECT value FROM table WHERE ID = @val; -Original Message- From: Alex [mailto:[EMAIL PROTECTED] Sent: Sunday, December 07, 2003 12:00 AM To: [EMAIL PROTECTED] Subject: [PHP] Re: Random Numbers.. Theheadsage wrote: > Hey, > > I've got a script which used to generate a random quote. It worked fine > untill this problem occurred.. > > Say we have 4 quotes with QuoteID's of 1 through to 4 > The script would grab a number of rows, and generate a random number > between 1 and this value (being 4 in this case) This worked fine untill, > one of the quotes was removed and another added, leaving 4 quotes once > again, but the last one had an ID of 5. The problem is the Random number > generated is between 1 and 4, so the final quote is never shown.. > > I tried using the RAND() function in the MySQL statement it's self, but > it's not random enough... > > Then I thought of doing this: > > Select all the Quote ID's from the DB. > Store them in an Array. > Generate a random number between 1 and the last ID. > If the Random Number matches a Quote ID, then display the quote, > otherwise Generate another > > But I couldn't get the code to work. Any suggestions on either how to > write the above, or made the MySQL RAND() function, more random? how about if ($randnumber == 4) $randnumber++; ? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Numbers..
Theheadsage wrote: Hey, I've got a script which used to generate a random quote. It worked fine untill this problem occurred.. Say we have 4 quotes with QuoteID's of 1 through to 4 The script would grab a number of rows, and generate a random number between 1 and this value (being 4 in this case) This worked fine untill, one of the quotes was removed and another added, leaving 4 quotes once again, but the last one had an ID of 5. The problem is the Random number generated is between 1 and 4, so the final quote is never shown.. I tried using the RAND() function in the MySQL statement it's self, but it's not random enough... Then I thought of doing this: Select all the Quote ID's from the DB. Store them in an Array. Generate a random number between 1 and the last ID. If the Random Number matches a Quote ID, then display the quote, otherwise Generate another But I couldn't get the code to work. Any suggestions on either how to write the above, or made the MySQL RAND() function, more random? how about if ($randnumber == 4) $randnumber++; ? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Quotes...
"Payne" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Hi, > > I am working on a project and I need to see sample quote for doing > random quotes. These quotes will be put from a database. Can some please > share me some sample code. Thanks. > > Chuck For more solutions go to, http://groups.google.com and type in, "select random row mysql" - Kevin
[PHP] Re: Random Image Store
"Monil Chheda" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > I want to create an php system that prevents automated > registrations. > > I have come up with the script in which users come > over and need to enter a random key displayed on the > images while submitting their info. If the number > entered is correct, the post is submitted, else, the > same form is displayed with another random key. > > Now, any one doing a "View Source" gets to know the > image source as "myscript.php". What I want to do is > to save the .jpeg image on my disc with the name as > "randomnumber.jpeg" , where randomnumber is generated > randomly for that page. > > Then, I would put an tag > and no one will be able to get the name of my php file > creating the image. Why should it matter whether they know the generating script's name? The only important thing is that they can't easily read off (or generate) the password-value passed to the image-creation script. You could store the passcode as a session variable, or send it as an encrypted get- variable, or hash into a stored dictionary. -- Hugh Bothwell [EMAIL PROTECTED] Kingston ON Canada v3.1 GCS/E/AT d- s+: a- C+++ L++>+++$ P+ E- W+++$ N++ K? w++ M PS+ PE++ Y+ PGP+ t-- 5++ !X R+ tv b DI+++ D-(++) G+ e(++) h-- r- y+ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Re: Random numbers in a cronned script?
if you seed it with unix time then you'll alway be seeding with something different in most cases, the random numbers that are generated will be random enough just my AU2c worth Martin -Original Message- From: lallous [mailto:[EMAIL PROTECTED]] Sent: Friday, September 13, 2002 6:51 PM To: [EMAIL PROTECTED] Subject: [PHP] Re: Random numbers in a cronned script? Yes, you're right about that point since the seed in most cases is computed from system time => increasing probability of having same number @ the same request time... you can change the seed with the time() too (not all days are the same). hope to hear others' opinions too. Elias "Leif K-Brooks" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I'm wondering if random numbers in a cronned script would be anywhere > near random (I know that rand() isn't true random, but I don't want > every number to be the same...)? Since the number is seeded from > time... and cron runs by time... > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random numbers in a cronned script?
Yes, you're right about that point since the seed in most cases is computed from system time => increasing probability of having same number @ the same request time... you can change the seed with the time() too (not all days are the same). hope to hear others' opinions too. Elias "Leif K-Brooks" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I'm wondering if random numbers in a cronned script would be anywhere > near random (I know that rand() isn't true random, but I don't want > every number to be the same...)? Since the number is seeded from > time... and cron runs by time... > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random Passwords Generator
Hello, On 08/18/2002 01:51 AM, César aracena wrote: > Hi all. I know there must be several ways of doing this but I wonder > what the best solution is. I'm tired of making and looking at scripts > that creates random passwords for users from a "words.txt" list. These > kind of passwords are limited only to the number of strange words your > fingers type into a file, for which I think it's not the most secure way > of giving away new passwords. I know there are other types of password > generating scripts, but I want to know from the users of this list which > would be the best one. > > I think that pre-made passwords (choose randomly) are dangerous, because > most users DO NOT change their given password once received and hackers > CAN access that words.txt file no matter what level of protection you > use for that server/folder. > > Isn't there a function or something that would generate random passwords > following given rules like: > > - from x to y characters long. > - lower AND/OR upper case. > - numbers AND characters combination. > - random numbers AND characters. > > Which are the functions (or combination of functions) I can use to > achieve this? Thanks in advance, You may want to try some ready to use components for that same purpose like these: http://www.phpclasses.org/passwordgenerator http://www.phpclasses.org/securepwd -- Regards, Manuel Lemos -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: Random mirrors and download quota
how about using the counter to store an id of the mirrors instead of
randomly picking one? this will provide you a sequential traverse
through all mirror sites.
if there are 10 sites, the counter will always be from 0 -> 9. this way
each mirror site will have equal share on hits. so if the counter == 2,
your script will know that the next hit will be to mirror site 2.
$_nextSite = (isset($_nextSite))?++$_nextSite % 10:0;
the above code will always ensure the counter counts from:
0 -> 9 -> 0 -> ...
this way, you can store all counters (into database?) on the main site
for all mirrors.
>
> "Andrew Conner" <[EMAIL PROTECTED]> escreveu na mensagem
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
>
>>Hello,
>>I have a script (at bottom) that, upon loading, will randomly select a
>>mirror or primary server (on average, the primary servers will be selected
>>twice as much). It all works good, but now, I have to add a "quota
>
> manager"
>
>>that will, for both mirrors, limit the times the file can be downloaded to
>>1200 times (there is only one file being downloaded). I have thought about
>>storing a text file for each of the two mirrors that shows the current
>
> count
>
>>of downloads, and it will be checked if the mirror is randomly selected
>
> and
>
>>if it is above 1200, will randomly select another server, and if it isn't,
>>will just add one to it and update the file. How would I go about this, or
>>is there a better way to do this?
>>Thanks in advance.
>>Andrew Conner
>>
>>The script (I know it doesn't use the best design, but it works, any
>
> better
>
>>ways of doing this?):
>>
>>>
>>// This array holds the servers, and has a double entry for the primary
>>servers
>>
>>$adArr = array("http://www.someprimaryserver.com/file.exe";,
>>
>>"http://www.someprimaryserver.com/file.exe";,
>>
>>"http://www.someprimaryserver2.com/file.exe";,
>>
>>"http://www.someprimaryserver2.com/file.exe";,
>>
>>"http://www.someprimaryserver3.com/file.exe";,
>>
>>"http://www.someprimaryserver3.com/file.exe";,
>>
>>"http://www.someprimaryserver4.com/file.exe";,
>>
>>"http://www.someprimaryserver4.com/file.exe";,
>>
>>"http://www.somemirror.com/file.exe";,
>>
>>"http://www.somemirror2.com/file.exe";);
>>
>>// This randomly gets a server...
>>
>>srand((double)microtime()*100);
>>
>>$wOne = rand(0, 9);
>>
>>$choice = $adArr[$wOne];
>>
>>// This fwds the user to the server picked.
>>
>>// Somewhere in here needs to be the mirror stuff...
>>
>>header("Location: $choice");
>>
>>?>
>>
>>
>>
>
>
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[PHP] Re: Random mirrors and download quota
Seems good to me, only this part:
> and it will be checked if the mirror is randomly selected and
> if it is above 1200, will randomly select another server
It's better to select those under 1200 right from the start. If you have
10 servers, you might make 9 checks before selecting the last one.
--
Julio Nobrega
Pode acessar:
http://www.inerciasensorial.com.br
"Andrew Conner" <[EMAIL PROTECTED]> escreveu na mensagem
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hello,
> I have a script (at bottom) that, upon loading, will randomly select a
> mirror or primary server (on average, the primary servers will be selected
> twice as much). It all works good, but now, I have to add a "quota
manager"
> that will, for both mirrors, limit the times the file can be downloaded to
> 1200 times (there is only one file being downloaded). I have thought about
> storing a text file for each of the two mirrors that shows the current
count
> of downloads, and it will be checked if the mirror is randomly selected
and
> if it is above 1200, will randomly select another server, and if it isn't,
> will just add one to it and update the file. How would I go about this, or
> is there a better way to do this?
> Thanks in advance.
> Andrew Conner
>
> The script (I know it doesn't use the best design, but it works, any
better
> ways of doing this?):
>
>
> // This array holds the servers, and has a double entry for the primary
> servers
>
> $adArr = array("http://www.someprimaryserver.com/file.exe";,
>
> "http://www.someprimaryserver.com/file.exe";,
>
> "http://www.someprimaryserver2.com/file.exe";,
>
> "http://www.someprimaryserver2.com/file.exe";,
>
> "http://www.someprimaryserver3.com/file.exe";,
>
> "http://www.someprimaryserver3.com/file.exe";,
>
> "http://www.someprimaryserver4.com/file.exe";,
>
> "http://www.someprimaryserver4.com/file.exe";,
>
> "http://www.somemirror.com/file.exe";,
>
> "http://www.somemirror2.com/file.exe";);
>
> // This randomly gets a server...
>
> srand((double)microtime()*100);
>
> $wOne = rand(0, 9);
>
> $choice = $adArr[$wOne];
>
> // This fwds the user to the server picked.
>
> // Somewhere in here needs to be the mirror stuff...
>
> header("Location: $choice");
>
> ?>
>
>
>
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[PHP] Re: Random number Question
OOPS!
You are right on..
I noticed my error after I sent it. The name='guess' was on the input.??
Daaa! it's Monday .. OK!!
This should work:
===
The computer has picked $another number between 1 and 10.
Guess the number and you win!
Enter your guess:
";
if (isset($guess))
{
srand((double)microtime()*100);
$number = floor(rand(1,10));
echo "The number is: $number";
if ($guess == $number)
echo 'You have won!';
else echo "Sorry that wasn't the answer";
}
?>
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[PHP] Re: Random number Question
Try something like this and see if it works???
The computer has picked $another number between 1 and 10.
Guess the number and you win!
Enter your guess:
";
if (isset($guess))
{
srand((double)microtime()*100);
$number = rand(1,10);
echo "The number is: $number";
if ($guess == $number)
{
echo 'You have won!';
}else{
echo "Sorry that wasn't the answer";
}
}
?>
=
Jennifer Downey wrote:
> Hi all,
>
> I having a hard time understanding why this won't work. I have a form which
> is suppose to pass the guess to the script. Here it is:
>
> the form is guess.php:
>
>
> The computer has picked a number between 1 and 10. Guess the number and you
> win!
>
>
> Enter your guess:
>
>
>
>
>
> The script is number.php:
>
> echo"The number is:";
>
> srand((double)microtime()*100);
> $number = rand(1,10);
>
> echo $number;
>
> if($guess = = $number) {
> echo"You have won!";
> }else{
> print("Sorry that wasn't the answer");
>
> }
> ?>
>
> Any help would be appreciated.
>
> Thanks in advance
> Jennifer Downey
>
>
>
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[PHP] Re: Random number Question
actually
if (intval($guess) == $number {
would be more acuate then the trim ( )
you would eliminate all alpha characters and floating points
saying it has to be a whole integer
Joel
"Ralph Friedman" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> In article <[EMAIL PROTECTED]>, Jennifer Downey
wrote:
>
> >
> >
> >
> you've got the "Name" attribute attached to the wrong INPUT element:
>
>
>
>
> > if($guess = = $number) {
> >
> incorrect syntax here. that should be:
> if ($guess == $number) {
>
> better would be:
>
> if (trim($guess) == $number {
>
> this will assure that there's no whitespace in $guess
>
> --
> Rgds
> Ralph
>
>
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[PHP] Re: Random number Question
In article <[EMAIL PROTECTED]>, Jennifer Downey wrote:
>
>
>
you've got the "Name" attribute attached to the wrong INPUT element:
> if($guess = = $number) {
>
incorrect syntax here. that should be:
if ($guess == $number) {
better would be:
if (trim($guess) == $number {
this will assure that there's no whitespace in $guess
--
Rgds
Ralph
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[PHP] Re: Random Selecting from mySQL
You could store the results in a session var to carry along the pages.
Then on the second just retrieve them.
Or maybe a second table with this info. Give each search an ID and store
the results there. It would be easy to implement:
INSERT INTO table ('',field) SELECT field FROM table ORDER BY rand()
The first '' is for the autoincrement that will be used as your search id.
--
Julio Nobrega.
Um dia eu chego lá:
http://sourceforge.net/projects/toca
Ajudei? Salvei? Que tal um presentinho?
http://www.submarino.com.br/wishlistclient.asp?wlid=664176742884
"Georgie Casey" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I know how to use the "ORDER BY rand()" command on the end of queries to
> randomize selection, but that's no good when you want to only display 10
> results per page. The next page the user chooses, randomizes again and
could
> show duplicate fields and not at all show other fields.
>
> Does anyone know a way round this?
>
> --
> Regards,
> Georgie Casey
> [EMAIL PROTECTED]
>
> ***
> http://www.filmfind.tv
> Ireland's Online Film Production Directory
> ***
>
>
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Re: Re: [PHP] Re: Random
yeah, my linux(Mandrake 8, Apache 1.3.22, PHP 4.1.0) box also gives me a 6 digit integer each time too. but when i tried on my win32 (Win2k, Apache 1.3.22, PHP 4.1.0), it is limited to a max of 32767 as indicated with getrandmax(). the origional author of the problem probably using windows too :) >> should be because rand() can\'t generate such a large number for u. >> >> use $max_random_number = getrandmax(); to check >> >> http://sg.php.net/manual/en/function.getrandmax.php > >Hmmm... My webserver gives me no problems witht this at >all. >(Sun E250 with Solaris 8, Apache 1.3.20 and PHP4.6) >This : >$floor = 10; >$ceiling = 99; >srand((double)microtime()*100); >$random = rand($floor, $ceiling); >print $random; >?> >Gives me a 6-digit integer every time -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] Re: Random
On 19 Dec 2001, David wrote: > should be because rand() can\'t generate such a large number for u. > > use $max_random_number = getrandmax(); to check > > http://sg.php.net/manual/en/function.getrandmax.php Hmmm... My webserver gives me no problems witht this at all. (Sun E250 with Solaris 8, Apache 1.3.20 and PHP4.6) This : Gives me a 6-digit integer every time -- Knut -- Knut H. Hassel Nielsen, [EMAIL PROTECTED] Principal Engineer, Office : ITS 204 IDI NTNU, Sem Saelands vei 7-9 N-7491 Trondheim, Norway Phone (+47) 73 59 18 46 Fax (+47) 73 59 60 35 "Programmers don't die, they just GOSUB without RETURN." -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP] Re: Random
should be because rand() can\'t generate such a large number for u. use $max_random_number = getrandmax(); to check http://sg.php.net/manual/en/function.getrandmax.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP] Re: random images fom db
Got it...if anyone's interested the code is below :)
/connect to db
$connectionToDBid = odbc_connect("codesnipits", "joecode", "joecode");
// sql statement
$sqlb = "SELECT imagepath FROM IMAGES";
/ run the query and dump into $numberofrecords variable
$row = odbc_do($connectionToDBid, $sqlb);
// create an array
$myArray = Array();
/ seed random number generator
srand ((float) microtime() * 1000);
/ loop through each record and dump image paths into array
while(odbc_fetch_row($row)){
// grab and assign all image paths to array
$imagepath = odbc_result($row,1);
$myArray[] = $imagepath ;
}
/ grab a random index from $myArray here
$imagearrayindex = array_rand($myArray);
$randomimage = $myArray[$imagearrayindex];
print "";
print "" ;
print "" ;
print "" . "Welcome back " .
$firstname . "";
print "";
print "" ;
print "";
print "";
print "";
"Joe Van Meer" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi there. I have s a php page that randomly grabs an image's path from a
db
> field and displays it on my php page. My problem is that sometimes when I
> refresh the image won't display. So I guess you can say I'm getting
> intermittent images...sometimes it displays and sometimes not. I've
checked
> all of my paths for all of the images and they are all the same. My code
is
> below.
>
> Thx, Joe
>
> /connect to db
> $connectionToDBid = odbc_connect("codesnipits", "joecode", "joecode");
>
>
> // sql statement
> $sqlb = "SELECT image_id FROM IMAGES";
>
> /run the query and dump into $row variable
> $row = odbc_do($connectionToDBid, $sqlb);
>
> // create an array
> $myArray = Array();
> srand ((float) microtime() * 1000);
>
> /loop through each record and dump image_ids into array
>
> while(odbc_fetch_row($row)){
> // grab and assign ids to array
> $imageid = odbc_result($row,1);
> $myArray[] = $imageid ;
>
> }
>
> /loop through and print out array values
> foreach ($myArray as $value){
> print "$value";
> }
>
>
> /create $randomimageid variable here
> $randomimageid = array_rand($myArray,1);
>
>
>
>
>
> /create query statement to grab random image path and dump into
variable -->
> randomimage
> $sqlr = "SELECT imagepath FROM IMAGES WHERE image_id = $randomimageid";
>
>
> /run the sql statement on the connection made
> $resultset = odbc_do($connectionToDBid, $sqlr);
>
> /dump into $randomimage here
> $randomimage = odbc_result($resultset, 1);
>
>
> /close connection to db
> odbc_close($connectionToDBid);
>
> print "";
> print "" ;
> print "" ;
> print "" . "Welcome back " .
> $firstname . "";
> print "";
> print "" ;
> print "";
> print "";
> print "";
>
>
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[PHP] Re: Random
$ceiling is too big. try to do this and see: echo getrandmax(); you might get 32767 as an output! therefore, $ceiling must be <= getrandmax(); try to scale down your floor and ceiling, ie: $max = $ceiling - $floor; $random = rand(0, $max) + $floor; "Andrew Duck" <[EMAIL PROTECTED]> wrote in message 005f01c15ea6$30375800$017f@localhost">news:005f01c15ea6$30375800$017f@localhost... #Create Random number $floor = 10; $ceiling = 99; srand((double)microtime()*100); $random = rand($floor, $ceiling); Warning: rand(): Invalid range: 10..99 in c:\my documents\ezone\testing\signup2.php on line 49 Can someone please tell me where i went wonr gin this coding. Thanks -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP] Re: random numbers help
You should call mt_srand((double) microtime() * 100) once, and only once, in any given script. -- WARNING [EMAIL PROTECTED] address is an endangered species -- Use [EMAIL PROTECTED] Wanna help me out? Like Music? Buy a CD: http://l-i-e.com/artists.htm Volunteer a little time: http://chatmusic.com/volunteer.htm - Original Message - From: Nikola Veber <[EMAIL PROTECTED]> Newsgroups: php.general To: php forum <[EMAIL PROTECTED]> Sent: Thursday, October 04, 2001 6:57 PM Subject: random numbers help > Hi ! > I'm having troubles with the random numbers. When I create a number witm mt_rand() > I always get the same number on my local server. I need this stuff to ranomly display > some text, and I'd like to have another value of the random number each time the > page is refreshed. > > Thanks > Nikola > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP] Re: random numbers help
[EMAIL PROTECTED] (Nikola Veber) wrote: > Hi ! > I'm having troubles with the random numbers. When I create a number witm mt_rand() > I always get the same number on my local server. I need this stuff to ranomly >display > some text, and I'd like to have another value of the random number each time the > page is refreshed. RTFM, you need to seed before you call mt_rand as stated on the man page. -- Henrik Hansen -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
[PHP] Re: Random number
"Rosen" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi,
> I'm using PHP code from manual:
> srand( (double) microtime() * 100);
> // Get random User ID
> $uid=rand();
>
> but it dowsn't work !
... I would make sure that microtime() is doing what you think it is;
something like
for ($i = 0; $i < 100; $i++) {
$k = (int) microtime();
echo "$k";
for ($j = 0; $j < 1; $j++)
$m = $j *3;
}
If you get a page of '0 / 0 / 0' you'll know what your problem is...
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[PHP] Re: RANDOM
>Could somebody please show me, send me an example or redirect me to a page which shows how to >show a random FLASH movie from a text file which contains different names of different movies >so that when i go on the page it shows lets say, 1 of the 5 movies in the text document. "; ?> There's a lot more HTML to do a SWF properly than that, though, no...? You can put as many movies as you want in your text file. -- WARNING [EMAIL PROTECTED] address is an endangered species -- Use [EMAIL PROTECTED] Wanna help me out? Like Music? Buy a CD: http://l-i-e.com/artists.htm Volunteer a little time: http://chatmusic.com/volunteer.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
