一些使用频率比较高的php函数

1.产生随机字符串函数 function random($length) { $hash = @#@#; $chars = @#abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz@#; $max = strlen($chars) – 1; mt_srand((double)microtime() * 1000000); for($i = 0; $i < $length; $i++) { $hash .= $chars[mt_rand(0, $max)]; } return $hash; } 2.截取一定长度的字符串