php提取域名

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

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

<?php
$url = "https://www.example.com/path/to/page?query=string";
preg_match('/^(?:https?:\/\/)?(?:[^@\n]+@)?(?:www\.)?([^:\/\n]+)/', $url, $matches);
$domain = $matches[1];

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

<?php
$url = "https://www.example.com/path/to/page?query=string";

// 验证 URL 格式
if (!filter_var($url, FILTER_VALIDATE_URL)) {
    echo "Invalid URL";
    exit;
}

// 使用 parse_url 提取域名
$parsed_url = parse_url($url);
$domain = $parsed_url['host'];

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