我的网站我想让他实现网站只能通过各大搜索网站访问才能正常打开，限制直接输入网址访问，php技术解决办法 ？

<?php
$search_engines = array(
    'google.com',
    'bing.com',
    'yahoo.com'
);

$referer = $_SERVER['HTTP_REFERER'];

if (!empty($referer)) {
    $parsed_referer = parse_url($referer);
    $referer_host = $parsed_referer['host'];

    foreach ($search_engines as $search_engine) {
        if (strpos($referer_host, $search_engine) !== false) {
            // 从搜索引擎访问
            // 在这里放置您的网站内容
            echo "Welcome! Your website content goes here.";
            exit;
        }
    }
}

// 直接输入网址访问或未从搜索引擎访问
echo "Access denied. Please visit our website through a search engine.";
?>