php 获取搜索引擎

<?php
function getSearchEngine() {
    $userAgent = $_SERVER['HTTP_USER_AGENT'];
    $engines = [
        'Googlebot' => 'Google',
        'bingbot' => 'Bing',
        'Yahoo! Slurp' => 'Yahoo',
        'Baiduspider' => '百度',
        'Sogou Spider' => '搜狗'
    ];

    foreach ($engines as $pattern => $engine) {
        if (strpos($userAgent, $pattern) !== false) {
            return $engine;
        }
    }

    return 'Unknown';
}

$searchEngine = getSearchEngine();
echo "当前访问网站的搜索引擎是：$searchEngine";
?>

if (empty($_SERVER['HTTP_USER_AGENT'])) {
    echo "无法识别搜索引擎";
} else {
    // 正常处理
}

function getSearchEngine() {
    $userAgent = $_SERVER['HTTP_USER_AGENT'];
    $engines = [
        'Googlebot' => 'Google',
        'bingbot' => 'Bing',
        'Yahoo! Slurp' => 'Yahoo',
        'Baiduspider' => '百度',
        'Sogou Spider' => '搜狗'
    ];

    foreach ($engines as $pattern => $engine) {
        if (strpos($userAgent, $pattern) !== false) {
            return $engine;
        }
    }

    // 增加更多的判断条件
    if (strpos($userAgent, 'bot') !== false || strpos($userAgent, 'spider') !== false) {
        return 'Unknown Bot';
    }

    return 'Unknown';
}