Re: [PHP] Random Numbers..
On Saturday 06 December 2003 10:39 pm, 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...
Perhaps something like
SELECT quote FROM quotes ORDER BY RAND('.mt_rand().') LIMIT 1
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
Wow, sounds complicated. How about
shuffle($quotes);
echo $quotes[0];
but much better speed-wise to do it from the DB.
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?
um, yeah.
--
Evan Nemerson
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http://coeusgroup.com/en
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[PHP] Random Numbers..
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] Random Numbers.. [Solved, Ignore]
Sorry for this e-mail, When I wrote this, my e-mail server was down, and it was archived for sending. By the time the e-mail server was restored, I had solved this problem. - TheHeadSage - Original Message - From: TheHeadSage [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, December 07, 2003 2:39 PM Subject: [PHP] Random Numbers.. 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] random numbers
Hi Tamas,
/* srand is not important since php v=4.2.0 */
$numbers = range (1,90);
$x = array_rand ($numbers, 5);
foreach ($x as $v) echo {$numbers[$v]} ;
It works fine, except the first query: php may restart
the random numbers, if it is not used for some seconds.
I'm not sure how to solve this, but I'm curious as to why you don't want to
use mt_rand:
?php
for ($i=1; $i=6; $i++)
$x[] = mt_rand(1, 90);
foreach ($x as $current)
echo $current. br /;
?
You still get an array at the end of it, which seems to be what you're
after.
Cheers
Jon
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Re: [PHP] random numbers
Jon! ?php for ($i=1; $i=6; $i++) $x[] = mt_rand(1, 90); foreach ($x as $current) echo $current. br /; ? Thanks for help, but your program may generate same numbers between the 5 generated numbers, hovewer I want to generate different numbers such as lottery-numbers. array_rand() is a very nice solution for this problem, other solutions with mt_rand() should be much longer. (I should care about if this random number has generated already or not) But if this is the only solution I'll do it in this way... (in this case there are a lot of useless php functions, that use random numbers adjusted to the simple srand() such as shuffle()) Tamas -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] random numbers
Hi Tamas,
?php
for ($i=1; $i=6; $i++)
$x[] = mt_rand(1, 90);
foreach ($x as $current)
echo $current. br /;
?
Thanks for help, but your program may generate same numbers between
the 5 generated numbers, hovewer I want to generate different numbers
such as lottery-numbers.
That's not a problem: just add a couple of lines to test for existence:
$i = 0;
while ($i6) {
$pick = mt_rand(1, 90);
if (!in_array($pick, $x)) {
$x[] = $pick;
$i++;
}
}
But if this is the only solution I'll do it in this way.
It's *never* the only solution :-)
Cheers
Jon
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[PHP] random numbers
Hi!
I'm using the following method to generate 5 random lottery
numbers:
/* srand is not important since php v=4.2.0 */
$numbers = range (1,90);
$x = array_rand ($numbers, 5);
foreach ($x as $v) echo {$numbers[$v]} ;
It works fine, except the first query: php may restart the random
numbers, if it is not used for some seconds. What should i do to
get rid of this problem? I want to use array_rand(), (so I don't
want to use mt_rand) because it's more nice than a complicated
selecting method...
I'm using Apache/1.3.27 (Win32) PHP/4.2.2
Thanks in advance
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[PHP] Random numbers in a cronned script?
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] 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]
