php - 跟踪像素插入数据库时​​生成 500(内部服务器错误)

Question

我正在创建一个跟踪像素并使用了 this answer作为起点。但是，在我尝试将数据插入数据库之前，一切正常。那时我收到 500(内部服务器错误)。

这是我的代码:

<?php
$im=imagecreate(1,1);
$white=imagecolorallocate($im,255,255,255);

imagesetpixel($im,1,1,$white);
header("content-type:image/jpg");
imagejpeg($im);
imagedestroy($im);

$client  = @$_SERVER['HTTP_CLIENT_IP'];
$forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
$remote  = $_SERVER['REMOTE_ADDR'];

function getUserIP() {
    $client  = @$_SERVER['HTTP_CLIENT_IP'];
    $forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
    $remote  = $_SERVER['REMOTE_ADDR'];

    if(filter_var($client, FILTER_VALIDATE_IP)) {
        $ip = $client;
    } else if (filter_var($forward, FILTER_VALIDATE_IP)) {
        $ip = $forward; 
    } else { 
        $ip = $remote;
    }

    return $ip;
}

$user_ip = getUserIP();
$ip_integer = ip2long($user_ip);
$web_url = 'myurl.com';
$sqlWebLeads = "INSERT INTO ip_details (ip_address, web_url) 
    VALUES ('$ip_integer','$web_url')";
$wpdb->query($sqlWebLeads);
?>

有什么想法吗？

Answer 1

It's running on a wordpress site so $wpdb->query is a global function and does not usually need to be defined.

这不是魔术，所以，如果您制作一个独立的 php 文件，它不会有 wordpress 全局定义对象，作为您的 $wpdb 数据库链接。

您需要在页面中设置该对象才能使用它，请查看 Using WPDB in standalone script?

$path = $_SERVER['DOCUMENT_ROOT'];

include_once $path . '/wp-config.php';
include_once $path . '/wp-load.php';
include_once $path . '/wp-includes/wp-db.php';
include_once $path . '/wp-includes/pluggable.php';

// $wpdb is available, do stuff