PHP method to check whether the IP address is legal

This article mainly shares with you the method of checking whether the IP address is legal in PHP. It is mainly shared with you in the form of code. I hope it can help you.

function checkIp($ip)
{
    $arr = explode('.',$ip);
    if(count($arr) != 4){
        return false;
    }else{
        for($i = 0;$i < 4;$i++){
            if(($arr[$i] <&#39;0&#39;) || ($arr[$i] > &#39;255&#39;)){
                return false;
            }
        }
    }
    return true;
}

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