php随机生成域名防封

<?php
function generateRandomDomain() {
    $domain = 'example';
    $tld = 'com';
    $subdomain = substr(str_shuffle('abcdefghijklmnopqrstuvwxyz0123456789'), 0, 10);
    $randomDomain = $subdomain . '.' . $domain . '.' . $tld;
    
    // 验证域名格式
    if (!preg_match('/^[a-z0-9]([a-z0-9\-]{0,61}[a-z0-9])?(\.[a-z0-9]([a-z0-9\-]{0,61}[a-z0-9])?)*\.[a-z]{2,6}$/', $randomDomain)) {
        throw new Exception('Invalid domain format');
    }
    
    return $randomDomain;
}

echo generateRandomDomain();
?>

<?php
function isDomainAvailable($domain) {
    return !checkdnsrr($domain, 'A');
}

function generateRandomDomain() {
    $domain = 'example';
    $tld = 'com';
    do {
        $subdomain = substr(str_shuffle('abcdefghijklmnopqrstuvwxyz0123456789'), 0, 10);
        $randomDomain = $subdomain . '.' . $domain . '.' . $tld;
    } while (!isDomainAvailable($randomDomain));
    
    return $randomDomain;
}

echo generateRandomDomain();
?>