php-general Digest 23 Jun 2010 03:59:06 -0000 Issue 6811

Tue, 22 Jun 2010 21:18:25 -0700 

php-general Digest 23 Jun 2010 03:59:06 -0000 Issue 6811

Topics (messages 306304 through 306325):

Re: Warning messages on web page.
        306304 by: Jim Lucas
        306305 by: Shreyas Agasthya
        306306 by: Daniel P. Brown
        306307 by: Paul M Foster

Stripping Characters
        306308 by: Rick Dwyer
        306309 by: David Èesal
        306310 by: Ashley Sheridan
        306311 by: Shreyas Agasthya
        306312 by: Richard Quadling
        306313 by: Nathan Nobbe
        306314 by: Richard Quadling
        306315 by: Shreyas Agasthya
        306316 by: Rick Dwyer
        306317 by: Ashley Sheridan
        306318 by: Jim Lucas
        306319 by: Rick Dwyer
        306322 by: Rick Dwyer
        306323 by: Ashley Sheridan
        306324 by: Rick Dwyer

Question about logins and locking
        306320 by: James Colannino
        306321 by: Tommy Pham

In what scenario an extension of a class is useful?
        306325 by: Camilo Sperberg

Administrivia:

To subscribe to the digest, e-mail:
        [email protected]

To unsubscribe from the digest, e-mail:
        [email protected]

To post to the list, e-mail:
        [email protected]


----------------------------------------------------------------------
--- Begin Message --- 
Mike Davies wrote:
> Hello,
> 
> This is my first post to this list and I am a novice at php coding. I
> can generally follow the code but not good at writing from scratch.
> 
> 
> I have recently been trying to add to a website which was originally
> developed by someone else and is written in php and mysql. I am trying
> to add a 'news' section to the site. This would be similar to an
> existing 'projects' section so, rather than write it completely from
> scratch I copied the php and the database tables from the 'project'
> section and renamed 'project' to 'news'.
> 
> 
> This is working well except for one thing – I get the following error
> messages when looking at the detailed news item. This code does not
> produce this warning in the project section which is using the same php
> code
> 
> 
> Warning: reset() [function.reset]: Passed variable is not an array or
> object in /home/b23aadf/public_html/news/details.php on line 72
> 
> Warning: Variable passed to each() is not an array or object
> in /home/b23aadf/public_html/news/details.php on line 73
> 
> 
> The relevant lines are :
> 

put a var_dump($thumbarray); right here and see what $thumbarray is

> 
> 72 reset($thumbsarray);
> 
> 73 while (list($key, $value) = each($thumbsarray)) {
> 
> The site is at www.aadf.co.uk and select 'News'.
> 
> Is anyone able to help resolve this? If you let me know what further
> information you require I can provide it.
> 
> 
> Mike Davies
> 


-- 
Jim Lucas

A: Maybe because some people are too annoyed by top-posting.
Q: Why do I not get an answer to my question(s)?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

--- End Message ---
--- Begin Message --- 
Mike,

A couple of things that I could understand reading carefully at the error.

1. reset takes an array as the input and perhaps your $thumbsarray is *not *an
array? Reset will set the internal pointer to the start of the array.

2. Warning # 2 is very closely related to #1 since you can iterate on an
array and not on a variable.

3. Just FYI - You can control the behavior should or not these
warnings/notices/errors in your php.ini file. Do a quick google and you
should be happy to see the result.

Regards,
Shreyas

On Tue, Jun 22, 2010 at 7:47 PM, Mike Davies <[email protected]>wrote:

> Hello,
>
> This is my first post to this list and I am a novice at php coding. I
> can generally follow the code but not good at writing from scratch.
>
>
> I have recently been trying to add to a website which was originally
> developed by someone else and is written in php and mysql. I am trying
> to add a 'news' section to the site. This would be similar to an
> existing 'projects' section so, rather than write it completely from
> scratch I copied the php and the database tables from the 'project'
> section and renamed 'project' to 'news'.
>
>
> This is working well except for one thing – I get the following error
> messages when looking at the detailed news item. This code does not
> produce this warning in the project section which is using the same php
> code
>
>
> Warning: reset() [function.reset]: Passed variable is not an array or
> object in /home/b23aadf/public_html/news/details.php on line 72
>
> Warning: Variable passed to each() is not an array or object
> in /home/b23aadf/public_html/news/details.php on line 73
>
>
> The relevant lines are :
>
>
> 72 reset($thumbsarray);
>
> 73 while (list($key, $value) = each($thumbsarray)) {
>
> The site is at www.aadf.co.uk and select 'News'.
>
> Is anyone able to help resolve this? If you let me know what further
> information you require I can provide it.
>
>
> Mike Davies
>
> --
> Mike Davies
> Integra Web Design, Rhynie, By Huntly, AB54 4LS
> 01464 861535            www.integrawebdesign.co.uk
>
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>


-- 
Regards,
Shreyas Agasthya

--- End Message ---
--- Begin Message --- 
On Tue, Jun 22, 2010 at 10:17, Mike Davies <[email protected]> wrote:
[snip!]
>
> Warning: reset() [function.reset]: Passed variable is not an array or
> object in /home/b23aadf/public_html/news/details.php on line 72
[snip!]
>
> Is anyone able to help resolve this? If you let me know what further
> information you require I can provide it.

    Note the first error (quoted herein).  That tells you that the
variable ($thumbsarray) is not actually an array.  How is it being
instantiated and defined?

-- 
</Daniel P. Brown>
UNADVERTISED DEDICATED SERVER SPECIALS
SAME-DAY SETUP
Just ask me what we're offering today!
[email protected] || [email protected]
http://www.parasane.net/ || http://www.pilotpig.net/

--- End Message ---
--- Begin Message --- 
On Tue, Jun 22, 2010 at 03:17:53PM +0100, Mike Davies wrote:

> Hello,
> 
> This is my first post to this list and I am a novice at php coding. I
> can generally follow the code but not good at writing from scratch.
> 
> 
> I have recently been trying to add to a website which was originally
> developed by someone else and is written in php and mysql. I am trying
> to add a 'news' section to the site. This would be similar to an
> existing 'projects' section so, rather than write it completely from
> scratch I copied the php and the database tables from the 'project'
> section and renamed 'project' to 'news'.
> 
> 
> This is working well except for one thing – I get the following error
> messages when looking at the detailed news item. This code does not
> produce this warning in the project section which is using the same php
> code
> 
> 
> Warning: reset() [function.reset]: Passed variable is not an array or
> object in /home/b23aadf/public_html/news/details.php on line 72
> 
> Warning: Variable passed to each() is not an array or object
> in /home/b23aadf/public_html/news/details.php on line 73
> 
> 
> The relevant lines are :
> 
> 
> 72 reset($thumbsarray);
> 
> 73 while (list($key, $value) = each($thumbsarray)) {
> 
> The site is at www.aadf.co.uk and select 'News'.
> 
> Is anyone able to help resolve this? If you let me know what further
> information you require I can provide it.

Well formed question. Thanks for that. I see too many which aren't.

I can't say why it's happening, but the $thumbsarray variable isn't
getting built the way it should. You can insert a line just before your
errors pop up like:

<?php echo '$thumbsarray: '; print_r($thumbsarray); ?>

or

<?php echo '$thumbsarray: '; echo var_dump($thumbsarray); ?>

or something similar. This will tell you if the variable is set and what
type it has. I'm guessing it's not set. You'll have to look earlier to
see where it should be built and isn't.

Paul

-- 
Paul M. Foster

--- End Message ---
--- Begin Message --- 
Hello List.
I need to remove characters from a string and replace them with and underscore. 

So instead of having something like:

$moditem = str_replace("--","_","$mystring");
$moditem = str_replace("?","_","$mystring");
$moditem = str_replace("!","_","$mystring");
....etc.
For every possible character I can think of, is there a way to simply omit any character that is not an alpha character and not a number value from 0 to 9? 


 --Rick

--- End Message ---
--- Begin Message --- 
Hello,
can this resolve your problem?

$trans = array(
"from" => "to",
"another" => "to");

$moditem = StrTr($moditem, $trans);

-- http://cz.php.net/manual/en/function.strtr.php

David

-----Original Message-----
From: Rick Dwyer [mailto:[email protected]] 
Sent: Tuesday, June 22, 2010 5:41 PM
To: [email protected]
Subject: [PHP] Stripping Characters

Hello List.

I need to remove characters from a string and replace them with and
underscore.

So instead of having something like:

$moditem = str_replace("--","_","$mystring");
$moditem = str_replace("?","_","$mystring"); $moditem =
str_replace("!","_","$mystring"); ....etc.

For every possible character I can think of, is there a way to simply omit
any character that is not an alpha character and not a number value from 0
to 9?


  --Rick



--
PHP General Mailing List (http://www.php.net/) To unsubscribe, visit:
http://www.php.net/unsub.php

--- End Message ---
--- Begin Message --- 
On Tue, 2010-06-22 at 11:40 -0400, Rick Dwyer wrote:

> Hello List.
> 
> I need to remove characters from a string and replace them with and  
> underscore.
> 
> So instead of having something like:
> 
> $moditem = str_replace("--","_","$mystring");
> $moditem = str_replace("?","_","$mystring");
> $moditem = str_replace("!","_","$mystring");
> ....etc.
> 
> For every possible character I can think of, is there a way to simply  
> omit any character that is not an alpha character and not a number  
> value from 0 to 9?
> 
> 
>   --Rick
> 
> 
> 


Use preg_replace(), which allows you to use a regex to specify what you
want to match:

$find = '/[^a-z0-9]/i';
$replace = '_';
$new_string = preg_replace($find, $replace, $old_string);

Thanks,
Ash
http://www.ashleysheridan.co.uk

--- End Message ---
--- Begin Message --- 
Perhaps, ereg_replace("your regex", "replacement_string", String
$variable).

Regards,
Shreyas

On Tue, Jun 22, 2010 at 9:10 PM, Rick Dwyer <[email protected]> wrote:

> Hello List.
>
> I need to remove characters from a string and replace them with and
> underscore.
>
> So instead of having something like:
>
> $moditem = str_replace("--","_","$mystring");
> $moditem = str_replace("?","_","$mystring");
> $moditem = str_replace("!","_","$mystring");
> ....etc.
>
> For every possible character I can think of, is there a way to simply omit
> any character that is not an alpha character and not a number value from 0
> to 9?
>
>
>  --Rick
>
>
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>


-- 
Regards,
Shreyas Agasthya

--- End Message ---
--- Begin Message --- 
On 22 June 2010 16:44, Ashley Sheridan <[email protected]> wrote:
> On Tue, 2010-06-22 at 11:40 -0400, Rick Dwyer wrote:
>
>> Hello List.
>>
>> I need to remove characters from a string and replace them with and
>> underscore.
>>
>> So instead of having something like:
>>
>> $moditem = str_replace("--","_","$mystring");
>> $moditem = str_replace("?","_","$mystring");
>> $moditem = str_replace("!","_","$mystring");
>> ....etc.
>>
>> For every possible character I can think of, is there a way to simply
>> omit any character that is not an alpha character and not a number
>> value from 0 to 9?
>>
>>
>>   --Rick
>>
>>
>>
>
>
> Use preg_replace(), which allows you to use a regex to specify what you
> want to match:
>
> $find = '/[^a-z0-9]/i';
> $replace = '_';
> $new_string = preg_replace($find, $replace, $old_string);
>
> Thanks,
> Ash
> http://www.ashleysheridan.co.uk
>
>
>

Watch out for white space in there. Tabs, spaces, new lines, etc. will
also be converted to underscore.

$find = '/[^\w\s]/i';

[^\w\s]

Match a single character NOT present in the list below «[^\w\s]»
   A word character (letters, digits, and underscores) «\w»
   A whitespace character (spaces, tabs, and line breaks) «\s»


"A "word" character is any letter or digit or the underscore
character, that is, any character which can be part of a Perl "word".
The definition of letters and digits is controlled by PCRE's character
tables, and may vary if locale-specific matching is taking place. For
example, in the "fr" (French) locale, some character codes greater
than 128 are used for accented letters, and these are matched by \w."

-- 
-----
Richard Quadling
"Standing on the shoulders of some very clever giants!"
EE : http://www.experts-exchange.com/M_248814.html
EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
ZOPA : http://uk.zopa.com/member/RQuadling

--- End Message ---
--- Begin Message --- 
On Tue, Jun 22, 2010 at 9:40 AM, Rick Dwyer <[email protected]> wrote:

> Hello List.
>
> I need to remove characters from a string and replace them with and
> underscore.
>
> So instead of having something like:
>
> $moditem = str_replace("--","_","$mystring");
> $moditem = str_replace("?","_","$mystring");
> $moditem = str_replace("!","_","$mystring");
> ....etc.
>
> For every possible character I can think of, is there a way to simply omit
> any character that is not an alpha character and not a number value from 0
> to 9?
>

check the docs, the first parameter may be an array of multiple needles,
e.g.

$moditem = str_replace(array('-', '?', '!'), '_', $mystring);

you could likely do something more elegant w/ preg_replace() tho.

-nathan

--- End Message ---
--- Begin Message --- 
"A "word" character is any letter or digit or the underscore
character, that is, any character which can be part of a Perl "word".
The definition of letters and digits is controlled by PCRE's character
tables, and may vary if locale-specific matching is taking place. For
example, in the "fr" (French) locale, some character codes greater
than 128 are used for accented letters, and these are matched by \w."

The above becomes ...

_A _word_ character is any letter or digit or the underscore
character_ that is_ any character which can be part of a Perl _word__
The definition of letters and digits is controlled by PCRE_s character
tables_ and may vary if locale_specific matching is taking place_ For
example_ in the _fr_ _French_ locale_ some character codes greater
than 128 are used for accented letters_ and these are matched by _w__

-- 
-----
Richard Quadling
"Standing on the shoulders of some very clever giants!"
EE : http://www.experts-exchange.com/M_248814.html
EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
ZOPA : http://uk.zopa.com/member/RQuadling

--- End Message ---
--- Begin Message --- 
Then, when does one use ereg_replace as against preg_replace? I read from
one the forums that preg_* is faster and ereg_* is if not faster but
simpler.

Is that it?

Regards,
Shreyas



On Tue, Jun 22, 2010 at 9:58 PM, Richard Quadling <[email protected]>wrote:

> "A "word" character is any letter or digit or the underscore
> character, that is, any character which can be part of a Perl "word".
> The definition of letters and digits is controlled by PCRE's character
> tables, and may vary if locale-specific matching is taking place. For
> example, in the "fr" (French) locale, some character codes greater
> than 128 are used for accented letters, and these are matched by \w."
>
> The above becomes ...
>
> _A _word_ character is any letter or digit or the underscore
> character_ that is_ any character which can be part of a Perl _word__
> The definition of letters and digits is controlled by PCRE_s character
> tables_ and may vary if locale_specific matching is taking place_ For
> example_ in the _fr_ _French_ locale_ some character codes greater
> than 128 are used for accented letters_ and these are matched by _w__
>
> --
> -----
> Richard Quadling
> "Standing on the shoulders of some very clever giants!"
> EE : http://www.experts-exchange.com/M_248814.html
> EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp
> Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
> ZOPA : http://uk.zopa.com/member/RQuadling
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>


-- 
Regards,
Shreyas Agasthya

--- End Message ---
--- Begin Message --- 
Thanks to everyone who responded.
Regarding the myriad of choices, isn't Ashley's, listed below, the one most like to guarantee the cleanest output of just letters and numbers? 


 --Rick


On Jun 22, 2010, at 11:44 AM, Ashley Sheridan wrote:


On Tue, 2010-06-22 at 11:40 -0400, Rick Dwyer wrote:
Use preg_replace(), which allows you to use a regex to specify what you want to match: 

$find = '/[^a-z0-9]/i';
$replace = '_';
$new_string = preg_replace($find, $replace, $old_string);

Thanks,
Ash
http://www.ashleysheridan.co.uk

--- End Message ---
--- Begin Message --- 
On Tue, 2010-06-22 at 13:35 -0400, Rick Dwyer wrote:

> Thanks to everyone who responded.
> 
> Regarding the myriad of choices, isn't Ashley's, listed below, the one  
> most like to guarantee the cleanest output of just letters and numbers?
> 
> 
>   --Rick
> 
> 
> On Jun 22, 2010, at 11:44 AM, Ashley Sheridan wrote:
> 
> > On Tue, 2010-06-22 at 11:40 -0400, Rick Dwyer wrote:
> > Use preg_replace(), which allows you to use a regex to specify what  
> > you want to match:
> >
> > $find = '/[^a-z0-9]/i';
> > $replace = '_';
> > $new_string = preg_replace($find, $replace, $old_string);
> >
> > Thanks,
> > Ash
> > http://www.ashleysheridan.co.uk
> >
> >
> 


It is clean, but as Richard mentioned, it won't handle strings outside
of the traditional 128 ASCII range, so accented characters and the like
will be converted to an underscore. Also, spaces might become an issue.

However, if you are happy that your input won't go beyond the a-z0-9
range, then it should do what you need.

Thanks,
Ash
http://www.ashleysheridan.co.uk

--- End Message ---
--- Begin Message --- 
Shreyas Agasthya wrote:
> Then, when does one use ereg_replace as against preg_replace? I read from
> one the forums that preg_* is faster and ereg_* is if not faster but
> simpler.

BUT, all the ereg_* has been depricated.  DO NOT USE THEM if you want your code
to work in the future.  :)

> 
> Is that it?
> 
> Regards,
> Shreyas
> 
> 
> 
> On Tue, Jun 22, 2010 at 9:58 PM, Richard Quadling <[email protected]>wrote:
> 
>> "A "word" character is any letter or digit or the underscore
>> character, that is, any character which can be part of a Perl "word".
>> The definition of letters and digits is controlled by PCRE's character
>> tables, and may vary if locale-specific matching is taking place. For
>> example, in the "fr" (French) locale, some character codes greater
>> than 128 are used for accented letters, and these are matched by \w."
>>
>> The above becomes ...
>>
>> _A _word_ character is any letter or digit or the underscore
>> character_ that is_ any character which can be part of a Perl _word__
>> The definition of letters and digits is controlled by PCRE_s character
>> tables_ and may vary if locale_specific matching is taking place_ For
>> example_ in the _fr_ _French_ locale_ some character codes greater
>> than 128 are used for accented letters_ and these are matched by _w__
>>
>> --
>> -----
>> Richard Quadling
>> "Standing on the shoulders of some very clever giants!"
>> EE : http://www.experts-exchange.com/M_248814.html
>> EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp
>> Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
>> ZOPA : http://uk.zopa.com/member/RQuadling
>>
>> --
>> PHP General Mailing List (http://www.php.net/)
>> To unsubscribe, visit: http://www.php.net/unsub.php
>>
>>
> 
> 


-- 
Jim Lucas

A: Maybe because some people are too annoyed by top-posting.
Q: Why do I not get an answer to my question(s)?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

--- End Message ---
--- Begin Message --- 


On Jun 22, 2010, at 1:41 PM, Ashley Sheridan wrote:
It is clean, but as Richard mentioned, it won't handle strings outside of the traditional 128 ASCII range, so accented characters and the like will be converted to an underscore. Also, spaces might become an issue.
However, if you are happy that your input won't go beyond the a-z0-9 range, then it should do what you need.
No, actually I'm fairly confident characters outside the 128 range are what are causing me problems now. 

So I will try Richard's method.

Thanks to all.

--Rick

--- End Message ---
--- Begin Message --- 
Hello again list.
My code for stripping characters is below. I'm hoping to get feedback as to how rock solid it will provide the desired output under any circumstance: 

My output must look like this (no quotes):

"This-is-my-string-with-lots-of-junk-characters-in-it"

The code with string looks like this:
$old_string = 'ééééThis is my & $string -- with ƒ lots˙˙˙of junk characters in it¡™£¢∞§¶•ªºœ∑´®† ¥¨ˆøπ“‘ååååååß∂ƒ©˙∆˚¬…æ`````````__________'; 

$find = '/[^a-z0-9]/i';
$replace = ' ';

$new_string = preg_replace($find, $replace, $old_string);
$new_string = preg_replace("/ {2,}/", "-", $new_string);
$new_string = preg_replace("/ {1,}/", "-", $new_string);

$new_string = rtrim($new_string, "-");
$new_string = ltrim($new_string, "-");


echo $new_string;
Will the logic above capture and remove every non alpha numeric character and place a SINGLE hyphen between the non contiguous alpha numeric characters? 

Thanks for the help on this.


 --Rick


On Jun 22, 2010, at 4:52 PM, Rick Dwyer wrote:




On Jun 22, 2010, at 1:41 PM, Ashley Sheridan wrote:
It is clean, but as Richard mentioned, it won't handle strings outside of the traditional 128 ASCII range, so accented characters and the like will be converted to an underscore. Also, spaces might become an issue.
However, if you are happy that your input won't go beyond the a- z0-9 range, then it should do what you need.
No, actually I'm fairly confident characters outside the 128 range are what are causing me problems now. 

So I will try Richard's method.

Thanks to all.

--Rick

--- End Message ---
--- Begin Message --- 
On Tue, 2010-06-22 at 20:03 -0400, Rick Dwyer wrote:

> Hello again list.
> 
> My code for stripping characters is below.  I'm hoping to get feedback  
> as to how rock solid it will provide the desired output under any  
> circumstance:
> 
> My output must look like this (no quotes):
> 
> "This-is-my-string-with-lots-of-junk-characters-in-it"
> 
> The code with string looks like this:
> 
> $old_string = 'ééééThis is my  & $string     -- with ƒ  
> lots˙˙˙of junk characters in it¡™£¢∞§¶•ªºœ∑´®† 
> ¥¨ˆøπ“‘ååååååß∂ƒ©˙∆˚¬…æ`````````__________';
> 
> $find = '/[^a-z0-9]/i';
> $replace = ' ';
> 
> $new_string = preg_replace($find, $replace, $old_string);
> $new_string = preg_replace("/ {2,}/", "-", $new_string);
> $new_string = preg_replace("/ {1,}/", "-", $new_string);
> 
> $new_string = rtrim($new_string, "-");
> $new_string = ltrim($new_string, "-");
> 
> 
> echo $new_string;
> 
> Will the logic above capture and remove every non alpha numeric  
> character and place a SINGLE hyphen between the non contiguous alpha  
> numeric characters?
> 
> Thanks for the help on this.
> 
> 
>   --Rick
> 
> 
> On Jun 22, 2010, at 4:52 PM, Rick Dwyer wrote:
> 
> >
> >
> > On Jun 22, 2010, at 1:41 PM, Ashley Sheridan wrote:
> >>
> >> It is clean, but as Richard mentioned, it won't handle strings  
> >> outside of the traditional 128 ASCII range, so accented characters  
> >> and the like will be converted to an underscore. Also, spaces might  
> >> become an issue.
> >>
> >> However, if you are happy that your input won't go beyond the a- 
> >> z0-9 range, then it should do what you need.
> >
> > No, actually I'm fairly confident characters outside the 128 range  
> > are what are causing me problems now.
> >
> > So I will try Richard's method.
> >
> > Thanks to all.
> >
> > --Rick
> >
> 
> 


You can remove the second line of code, as the third one is replacing
what line 2 does anyway.

Also, instead of a rtrim and ltrim, you can merge the two with a single
call to trim, which will work on both ends of the string at once.

Thanks,
Ash
http://www.ashleysheridan.co.uk

--- End Message ---
--- Begin Message --- 
Very good.
Thank you.

 --Rick


On Jun 22, 2010, at 8:14 PM, Ashley Sheridan wrote:


On Tue, 2010-06-22 at 20:03 -0400, Rick Dwyer wrote:


Hello again list.
My code for stripping characters is below. I'm hoping to get feedback 
as to how rock solid it will provide the desired output under any
circumstance:

My output must look like this (no quotes):

"This-is-my-string-with-lots-of-junk-characters-in-it"

The code with string looks like this:

$old_string = 'ééééThis is my  & $string     -- with ƒ
lots˙˙˙of junk characters in it¡™£¢∞§¶•ªºœ∑´®†
¥¨ˆøπ“‘ååååååß∂ƒ©˙∆˚¬… æ`````````__________'; 

$find = '/[^a-z0-9]/i';
$replace = ' ';

$new_string = preg_replace($find, $replace, $old_string);
$new_string = preg_replace("/ {2,}/", "-", $new_string);
$new_string = preg_replace("/ {1,}/", "-", $new_string);

$new_string = rtrim($new_string, "-");
$new_string = ltrim($new_string, "-");


echo $new_string;

Will the logic above capture and remove every non alpha numeric
character and place a SINGLE hyphen between the non contiguous alpha
numeric characters?

Thanks for the help on this.


  --Rick


On Jun 22, 2010, at 4:52 PM, Rick Dwyer wrote:

>
>
> On Jun 22, 2010, at 1:41 PM, Ashley Sheridan wrote:
>>
>> It is clean, but as Richard mentioned, it won't handle strings
>> outside of the traditional 128 ASCII range, so accented characters
>> and the like will be converted to an underscore. Also, spaces might 
>> become an issue.
>>
>> However, if you are happy that your input won't go beyond the a-
>> z0-9 range, then it should do what you need.
>
> No, actually I'm fairly confident characters outside the 128 range
> are what are causing me problems now.
>
> So I will try Richard's method.
>
> Thanks to all.
>
> --Rick
>
You can remove the second line of code, as the third one is replacing what line 2 does anyway.
Also, instead of a rtrim and ltrim, you can merge the two with a single call to trim, which will work on both ends of the string at once. 

Thanks,
Ash
http://www.ashleysheridan.co.uk

--- End Message ---
--- Begin Message --- 
Hey everyone,

I have a question about logins.  Let's say that I want to allow each
user account to login only once at a time.  I would then need some kind
of locking mechanism to make sure that the same user can't login again
somewhere else until first logging off.  What's a good way to achieve
this?  I want to be able to handle situations in which the user closes
their browser without first logging off, where I would want to count
that as a logout.

Perhaps I could do some kind of periodic polling in Javascript, combined
with a query to the database that sets a value when the user logs in and
when the user logs out?  I'm just looking for some conceptual ideas. 
Thanks everyone!

James

--- End Message ---
--- Begin Message --- 
> -----Original Message-----
> From: James Colannino [mailto:[email protected]]
> Sent: Tuesday, June 22, 2010 2:29 PM
> To: [email protected]
> Subject: [PHP] Question about logins and locking
> 
> Hey everyone,
> 
> I have a question about logins.  Let's say that I want to allow each user
> account to login only once at a time.  I would then need some kind of
locking
> mechanism to make sure that the same user can't login again somewhere
> else until first logging off.  What's a good way to achieve this?  I want
to be
> able to handle situations in which the user closes their browser without
first
> logging off, where I would want to count that as a logout.
> 
> Perhaps I could do some kind of periodic polling in Javascript, combined
with
> a query to the database that sets a value when the user logs in and when
the
> user logs out?  I'm just looking for some conceptual ideas.
> Thanks everyone!
> 
> James
> 

James,

1) Set an encrypted (to prevent hijacking and eavesdropping) cookie to
expire when browser closes
2) Have a table in the DB backend to keep track if the user is logged in or
not and when was the last time the validated user access your site (this
gets updated when the user visit a link on your site by checking the cookie
and the DB entry of the session ID)
3) Set your session timeout accordingly to you security requirement
4) Have a javascript on a timeout to self-logoff should the user is AFK
longer than your session timeout.

If another user or if the same user tries to login with a different browser,
you can check the status of the user.  If the user is logged in, you can
deny it after the authentication.  Should the user closes the browser
without having to logoff, you can check when was the last time the user
accessed your site and see if it's been longer than your session timeout.
For security purposes, you can optionally send a courtesy email notifying
that the user didn't logout properly since last accessed.  This way, you can
track whether if the user's system is compromised in some way or not.  It
all depends on what kind of application, service, user level access, and the
strict security you require.

Regards,
Tommy

--- End Message ---
--- Begin Message --- 
Hello everybody :)

I'm really intrigued on something... In what real-world applications could
an extension of a class be really useful?

Let's say I have this code:

class foo {
  function hello_world($a) {
    echo 'foo hello world';
  }

  function bye_world() {
    echo 'foo bye world';
  }
}

class bar extends foo {
  function hello_world($a,$b) {
    echo 'bar hello world';
  }
}

Point 1: Why not just overwrite the hello_world method in the foo class in
the first place? Wouldn't that save code and possible incompatibility or
consistency issues between the code you've already written and between the
two classes ? (Assuming that you do some things based on the $a and $b
values).

Point 2: On the other hand, maybe I could apply different operations to both
(e.g.: return 1 in foo and 2 in bar), without breaking the basic
functionality already achieved in the foo class. (Maybe considering that I
want to apply an update or patch to an already existing application,
however, is this is the scenario, I should always fix the old code wherever
I invoke the foo class which returns us to point 1).

Point 3: Ok, maybe I don't want a specific class to be so huge and I
separate it into "pieces" of classes. But then again, wouldn't it be simpler
to just save some code and keeping only one file with the entire class?

Is it just that or do I miss something else? I'm not saying it is useless,
it sounds indeed fantastic to work with... but I just can't imagine in what
real-world cases this would be useful.

Greetings !

-- 
Mailed by:
UnReAl4U - unreal4u
ICQ #: 54472056
www1: http://www.chw.net/
www2: http://unreal4u.com/

--- End Message ---

Reply via email to