使用php检查IP地址

Question

I am writing a thumb up/down rating system on items, The rating system should allow the user to rate only one time. I have an SQL table in the database named rating with columns : id, itemname, commentno. and another table ip_check that has : id, commentno, ip.

The commentno will be a foreign key and the syntax to get the ip should be like this : <?php $ip = $_SERVER['REMOTE_ADDR']; ?> as I checked on line on several links like this one.

Now what is the proper and easiest way to add a mysql if condition. I checked this link as well but I am still looking for something more specific, any help on this?

Answer 1

For saving and in Mysql I recommended use Mysql function INET_NTOA() and INET_ATON()

For validating and get IP address I using this functions:

function is_ip($ip) {
    global $localIPs;
    $test = 0;
    $pattern='/^(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$/';
    $ip = explode(',', $ip);
    $ip = array_map('trim', $ip);
    foreach ($ip as $key => $value) {
        if(array_search($value, $localIPs)===false && preg_match($pattern, $value)) $test = $value;
    }
    if(!empty($test)) return $test;
    else return false;
}

function get_ip() {
    $ip='';
    if(!empty($_SERVER['HTTP_X_REAL_IP']) && is_ip($_SERVER['HTTP_X_REAL_IP'])) $ip=is_ip($_SERVER['HTTP_X_REAL_IP']);
    elseif(!empty($_SERVER['HTTP_CLIENT_IP']) && is_ip($_SERVER['HTTP_CLIENT_IP'])) $ip=is_ip($_SERVER['HTTP_CLIENT_IP']);
    elseif(!empty($_SERVER['HTTP_X_FORWARDED_FOR']) && is_ip($_SERVER['HTTP_X_FORWARDED_FOR'])) $ip=is_ip($_SERVER['HTTP_X_FORWARDED_FOR']);
    else $ip=is_ip($_SERVER['REMOTE_ADDR']);
    return $ip;
}