php域名变量

<?php
$url = "https://www.example.com/path/to/page?query=string";
$parsedUrl = parse_url($url);
$domain = $parsedUrl['host'];

echo "Domain: " . $domain; // 输出: Domain: www.example.com
?>

<?php
function isValidDomain($domain) {
    $pattern = '/^(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}\.?|[a-zA-Z0-9\-]{2,}\.?)$/';
    return preg_match($pattern, $domain);
}

$domain = "example.com";
if (isValidDomain($domain)) {
    echo "Valid domain";
} else {
    echo "Invalid domain";
}
?>

<?php
$domains = [
    "www.example.com",
    "www.example2.com"
];

$requestDomain = $_SERVER['HTTP_HOST'];

if (in_array($requestDomain, $domains)) {
    echo "Welcome to our site!";
} else {
    echo "Domain not allowed";
}
?>