fun

gistfile1.php

<?php
ini_set('xdebug.max_nesting_level', 10000000000000000000000000000000);
$set = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9','0','@','!','#','$','%','^','&','*','(',')','-',' ','+','-');
$set = array_merge($set,$set,$set,$set,$set,$set,$set,$set,$set,$set,$set,$set,$set,$set,$set,$set,$set,$set);
$results = array();
gen_nos($set,$results);
function gen_nos(&$set, &$results) {
    for($i=0; $i<count($set); $i++) {
        $results[] = $set[$i];
        $tempset = $set;
        array_splice($tempset, $i, 1);
        $tempresults = array();
        gen_nos($tempset, $tempresults);
        foreach($tempresults as $res) {
            $results[] = $set[$i] . $res;
			echo $set[$i] . $res . PHP_EOL;
        }
    }
}