使用PHP从(搜索引擎)引荐网址获取关键字

<?php
function getKeywordsFromBaidu($query) {
    $url = "https://www.baidu.com/s?wd=" . urlencode($query);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $html = curl_exec($ch);
    curl_close($ch);

    $keywords = array();
    preg_match_all('/<a.*?>(.*?)<\/a>/is', $html, $matches);
    foreach ($matches[1] as $match) {
        $match = strip_tags($match);
        if (strlen($match) > 0) {
            $keywords[] = $match;
        }
    }

    return $keywords;
}

$query = "PHP 从搜索引擎获取关键字";
$keywords = getKeywordsFromBaidu($query);
print_r($keywords);
?>