php 获取指定数量随机字符串函数
//获取随机字符串函数 function rands($length){ $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; $code = ''; for ($i = 0; $i < $length; $i++) { $code .= $chars[ mt_rand(0, strlen($chars) - 1) ]; } return $code; } //获取7位随机字符 $code = rands(7);