PHP checks whether the IP is legal

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No regular judgment is used, just a function written in PHP to verify whether the IP address is legal

function checkIp($ip){

    $arr=explode('.',$ip);

    if(count($arr) != 4){

        return false;

    }else{

        for($i = 0;$i < 4;$i++){

            if(($arr[$i] <'0') || ($arr[$i] > '255')){

                return false;

            }

        }

    }

    return true;

}

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