PHP正则获取网站标题、关键字、描述

preg_match("/<title>(.*)<\/title>/i", $html, $title);
preg_match("/<meta name=\"keywords\" content=(.*)\/>/i", $html, $keywords);
preg_match("/<meta name=\"description\" content=(.*)\/>/i", $html, $description);

/**
 * 获取TDK
 * @return string|\think\response\Json|\think\response\View
 * @author 申霖
 * @time 2019/7/30 0030 下午 8:01
 */
public function res()
{
    $url = input('post.url');
    if (!$url) {
        return json(['code' => 100, 'msg' => '缺少url地址']);
    }
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $html = curl_exec($curl);
    curl_close($curl);
    if (!$html) {
        return "未找到数据";
    }
    $data['title']['length']  = $data['keywords']['length'] = $data['description']['length'] = 0;
    $data['title']['content'] = $data['keywords']['content'] = $data['description']['content'] = '';
    $html                     = mb_substr($html, 0, 1000);
    preg_match("/<title>(.*)<\/title>/i", $html, $title);
    preg_match("/<meta name=\"keywords\" content=(.*)\/>/i", $html, $keywords);
    preg_match("/<meta name=\"description\" content=(.*)\/>/i", $html, $description);
    if (isset($title[1])) {
        $data['title']['content'] = str_replace('"', '', $title[1]);
        $data['title']['length']  = mb_strlen($data['title']['content']);
    }
    if (isset($keywords[1])) {
        $data['keywords']['content'] = str_replace('"', '', $keywords[1]);
        $data['keywords']['length']  = mb_strlen($data['keywords']['content']);
    }
    if (isset($description[1])) {
        $data['description']['content'] = str_replace('"', '', $description[1]);
        $data['description']['length']  = mb_strlen($data['description']['content']);
    }
    return view('tool/res', ['data' => $data, 'url' => $url]);
}