如何在php实现域名授权

<?php
// 定义允许访问的域名列表
$allowedDomains = ['example.com', 'www.example.com'];

// 获取请求头中的Host字段
$host = $_SERVER['HTTP_HOST'];

// 检查Host是否在允许的域名列表中
if (!in_array($host, $allowedDomains)) {
    header('HTTP/1.1 403 Forbidden');
    echo 'Access Denied';
    exit();
}

// 如果通过授权，继续处理请求
echo 'Access Granted';
?>

<?php
$allowedDomains = ['*.example.com'];

$host = $_SERVER['HTTP_HOST'];
$matched = false;

foreach ($allowedDomains as $domain) {
    if (preg_match('/^' . str_replace('.', '\.', $domain) . '$/', $host)) {
        $matched = true;
        break;
    }
}

if (!$matched) {
    header('HTTP/1.1 403 Forbidden');
    echo 'Access Denied';
    exit();
}

echo 'Access Granted';
?>

<?php
$allowedDomains = ['example.com', 'www.example.com'];

$host = $_SERVER['HTTP_HOST'];
$protocol = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443 ? 'https' : 'http';

if (!in_array($host, $allowedDomains) || $protocol !== 'https') {
    header('HTTP/1.1 403 Forbidden');
    echo 'Access Denied';
    exit();
}

echo 'Access Granted';
?>