http://www.kaasan.info/archives/3748

ramdomPassword.php

<?php
  //ついでに非　Laravelerの人のためにランダムなパスワード生成
  private function makeRandomPassword()
    {
        $collectionA = array_rand(array_flip(range('a', 'z')), 4);
        $collectionB = array_rand(array_flip(range('A', 'Z')), 4);
        $collectionC = array_rand(array_flip(range(0, 9)), 3);
        $collectionD = array_rand(array_flip(['!','$','%','&','(',')','*','+','/']), 3);
        $passwordstr = array_merge($collectionA,$collectionB,$collectionC,$collectionD);
        return str_shuffle(implode($passwordstr));
    }