gistfile1.php

function random_alnum($len = 8)
{	
	$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
	
	$str = '';
	for ($i=0; $i < $len; $i++)
	{
		$str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
	}
	
	return $str;
}