wordpress 付款抓取并保存到TXT

$url = $_SERVER["QUERY_STRING"];
$useragent = $_SERVER['HTTP_USER_AGENT'];
function getip() {
    if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP") , "unknown")) {
        $ip = getenv("HTTP_CLIENT_IP");
    } else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR") , "unknown")) {
        $ip = getenv("HTTP_X_FORWARDED_FOR");
    } else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR") , "unknown")) {
        $ip = getenv("REMOTE_ADDR");
    } else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) {
        $ip = $_SERVER['REMOTE_ADDR'];
    } else {
        $ip = "unknown";
    }
    return $ip;
}
if(substr_count($url,'checkout/order-received')>=1){
    $filename='pay.txt';
    $file=fopen($filename,"a+");
    $res="www.geiliyou.com";
    $result=‘ok‘;
    fwrite($file,getip()."t".$useragent."n");
}