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example: passwd.php?l=30&a=lsd

l = length
a = alphabet (d = digits [0-9]; h = hex digits [A-F]; l = lower case [a-z]; u = upper case [A-Z]; s = special (see source code))
s = seed (don't use it unless you really know what you're doing)

    ---------------------------

and here comes the code:
<?php
header("Content-type: text/plain");
$digits  = '0123456789'; // d
$hex_dig = 'ABCDEF'; // h
$lower_c = 'abcdefghijklmnopqrstuvwxyz'; // l
$upper_c = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; // u
$special = '!"#$%&\\\'()*+,-./:;<=>?@[\\]^_`{|}~'; // s
$alphabet= '';
$mode = $_GET['a'];
if(stripos($mode, 'd') !== FALSE)
	$alphabet .= $digits;
if(stripos($mode, 'h') !== FALSE)
	$alphabet .= $hex_dig;
if(stripos($mode, 'l') !== FALSE)
	$alphabet .= $lower_c;
if(stripos($mode, 'u') !== FALSE)
	$alphabet .= $upper_c;
if(stripos($mode, 's') !== FALSE)
	$alphabet .= $special;
if($alphabet == '')
	$alphabet = $digits . $lower_c . $upper_c . $special;
function make_seed()
{
   list($usec, $sec) = explode(' ', microtime());
   return (float) $sec + ((float) $usec * 100000);
}
mt_srand($_GET['s']?$_GET['s']:make_seed());
$len=$_GET['l']>0?$_GET['l']:20;
for($n;$n<10;++$n) {
	for($i=$len;$i;--$i)
		echo $alphabet[mt_rand(0, strlen($alphabet)-1)];
	echo "\n";
}
?>

example: passwd.php?l=30&a=lsd

l = length
a = alphabet (d = digits [0-9]; h = hex digits [A-F]; l = lower case [a-z]; u = upper case [A-Z]; s = special (see source code))
s = seed (don't use it unless you really know what you're doing)

    ---------------------------

and here comes the code:
<?php readfile(__FILE__); ?>