php根据url获取域名

<?php
function getDomainFromUrl($url) {
    $parsedUrl = parse_url($url);
    if (!empty($parsedUrl['host'])) {
        return $parsedUrl['host'];
    }
    return null;
}

$url = "https://www.example.com/path/to/resource?query=param";
$domain = getDomainFromUrl($url);
echo "Domain: " . $domain; // 输出: Domain: www.example.com
?>

function getDomainFromUrl($url) {
    $parsedUrl = parse_url($url);
    if (!empty($parsedUrl['host'])) {
        $domain = $parsedUrl['host'];
        if (strpos($domain, ':') !== false) {
            $domain = substr($domain, 0, strpos($domain, ':'));
        }
        return $domain;
    }
    return null;
}

function getDomainFromUrl($url) {
    if (!filter_var($url, FILTER_VALIDATE_URL)) {
        return "Invalid URL";
    }
    $parsedUrl = parse_url($url);
    if (!empty($parsedUrl['host'])) {
        return $parsedUrl['host'];
    }
    return null;
}