cURL页面和导航DOM - cURL Page and Navigate DOM

cURL Page and Navigate DOM

本文关键字：导航 DOM cURL | 更新日期: 2023-09-27

我只是想用下面的脚本检索页面的标题。然而，我做错了什么，因为我一直得到这个错误：

PHP Fatal error:  Call to a member function getElementsByTagName() on a non-object in /Users/robertquinn/Desktop/SCRAPE/asu.php on line 22

这是我第一次使用旋度函数，所以如果我把这里的东西搞砸了，请告诉我。getElementsByTagName（）只是一个XML DOM方法吗？

<?php  
    function get_data($url) {
        $userAgent = 'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 GTB5';
        $ch = curl_init();
        curl_setopt($ch,CURLOPT_COOKIE,"someCookie=2127;onlineSelection=C");
        curl_setopt ($ch, CURLOPT_COOKIEFILE, 'cookie.txt');
        curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
        curl_setopt($ch, CURLOPT_USERAGENT, $userAgent);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_FAILONERROR, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_AUTOREFERER, true);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 100);
        $html = curl_exec($ch);
        curl_close($ch);
        $doc = new DOMDocument();
        $body = $doc->loadHTML( $html );
        $title_value = $body->getElementsByTagName('title')->nodeValue;
        echo $title_value;
    }
    get_data('http://www.someurl.com');
    ?>

也更改DOMDocument部分：

 $doc = new DOMDocument();
 $doc->loadHTML( $html );
 //Suppress strict errors or you could just suppress errors directly e.g: @$doc->loadHTML( $html );
 $doc->strictErrorChecking = false;
 $title_value = $doc->getElementsByTagName('title')->item(0)->nodeValue;

我喜欢使用simple_html_dom非常简单，例如，我只需要做

...
$page = curl_exec($ch);
$html = str_get_html($page);
echo $html->find('title', 0)->plaintext;