Easiest way to generate a random password in PHP

In many web app, there are alot of them use random password generator for their user such as 2 step validation, phone verification, email verification and more. By using str_shuffle() in PHP become more handy to create random password:

 * note that..this is not a secure random password.. please use other encryption method or use java randomLib

1. <?php
2. function characterSuffle($len = 6) {
3.     $list = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_-=+;:,.?";
4.     $str = substr(str_shuffle($list), 0, $len );
5.     return $str;
6. }
9. echo characterSuffle();
10. echo characterSuffle(8);
11. echo characterSuffle(16);
12. echo characterSuffle(32);
13. ?>