rand()

[jpr]

Hey, never got the hang of this function. I need to generate a 15 character random 'string'. The characters can consist of 0-9, and a-z. This is very importan that the same string never gets generated again.

Thanx!
Jason R.

[ceemac]

<?php
$characters = "abcdefghijklmnopqrstuvwxyz1234567890";
$len=strlen($characters);

for ($i=0; $i < 15; $i++)
{
$rand=rand(0,$len);
$generate.=$characters{$rand};
}
echo $generate;
?>

Will that do??

Mark

[BuzzLY]

This code is untested... let me know if it doesn't work.

<?php
function StringGenerator($str_len){

$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
$chr = strlen($chars)-1; 
  for($i=0;$i<$str_len;$i++) { 
	mt_srand((double)microtime()*1000000); // unnecessary for 4.2.0 and later...
	$randstring .= $chars[mt_rand(0, $chr)];
 }
 return $randstring;
}
?>

::edit::

Jinx! LOL... I'll leave mine up, even though it's almost identical. The only real difference is that mine gives you the option of changing the length by passing a different value to the function. Plus, it uses mt_rand(), which is faster than rand(). That's really a moot point for such a simple function.