random string

[deep]

Hello,

i need to generate a random string. The string should be 8 chars in length and mix the lettera a-z and numbers 0-9 in it.

Pls help!

Thanks!

[Nixon]

<?php 
for($len=8,$r='';strlen($r)<$len;$r.=chr(!mt_rand(0,2)?
mt_rand(48,57):(!mt_rand(0,1)?mt_rand(65,90):mt_rand
(97,122))));
?>

[laserlight]

Take a look at [man]mt_rand/man and [man]range/man

[deep]

Hello Nixon,

What does <img src="images/smilies/frown.gif" border="0" alt=""> do??

Could you give me a easier example to understand with 'if' instead od '?'

Thx!

[laserlight]

He edited the post, but forgot to change the HTML code inserted by the forum's parser.

Here's a simple implementation:

<?php
function genRandStr($len) {
	$chars = 'abcdefghijklmnopqrstuvwxyz0123456789';
	$max = 35; //or (strlen($chars) - 1)
	$ret = '';
	for ($i = 0; $i < $len; $i++)
		$ret .= $chars{mt_rand(0, $max)};
	return $ret;
}
echo genRandStr(8);
?>

[mrhappiness]

if you need a-z and 0-9 only:

function randomstring($len = 8)
{
  return substr(md5(microtime()), 0, $len);
}

[laserlight]

Actually, that just gives a-f0-9

and it should be substr()

[deep]

thanks all! 🙂