PHP function to get client IP

/**
 * Get client IP address
 * @param integer $type Return type 0 Return IP address 1 Return IPV4 address number
 * @return mixed
 */
function get_client_ip($type = 0) {
    $type = $type ? 1 : 0;
    static $ip = NULL;
    if ($ip !== NULL) return $ip[$type];
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
        $pos = array_search('unknown',$arr);
        if(false !== $pos) unset($arr[$pos]);
        $ip = trim($arr[0]);
    }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    }elseif (isset($_SERVER['REMOTE_ADDR'])) {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    // IP address legal verification
    $long = ip2long($ip);
    $ip = $long ? array($ip, $long) : array('0.0.0.0', 0);
    return $ip[$type];
}

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