Sample code for php to use preg_match() function to verify IP address

preg_match() Function is used to perform regular expression matching, returning 1 successfully, otherwise returning 0. This article mainly introduces how PHP uses the preg_match() function to verify IP addresses, involving PHP's regular matching operations for numbers and strings. Friends in need can refer to , as follows ：

<?php
/*
*@return Boolen
*@param String $ip 要匹配的ip地址
*@param String $pat 匹配的正则规则
*@param Boolen 匹配成功后返回的布尔值
*preg_match()
*0为不成功，1为成功
*/
function fun($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");

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