<?php/**@return Boolen*@param String $ip 要匹配的ip地址*@param String $pat 匹配的正則規則*@param Boolen 匹配成功后返回的布爾值*preg_match()*0為不成功，1為成功*/function fun($ip){    //0.0.0.0--- 255.255.255.255    $pat = "/^(((1?/d{1,2})|(2[0-4]/d)|(25[0-5]))/.){3}((1?/d{1,2})|(2[0-4]/d)|(25[0-5]))$/";    if(preg_match($pat,$ip)){      $num = preg_match($pat,$ip);      return $num;    }else{      $num = preg_match($pat,$ip);      return $num;    }}echo fun("255.255.255.255");