InvalidArgumentException-当前节点列表为空. [英] InvalidArgumentException - The current node list is empty.

问题描述

我正在使用goutte sracper抓取数据，出现类似InvalidArgumentException - The current node list is empty.的错误，下面是我正在使用的代码

I am using goutte sracper to scrape the data , i m getting error like InvalidArgumentException - The current node list is empty. Below is the code which i m using

$string = $crawler->filter('div#links.results')->html();


        if ( empty( $string ) )
         return false;

        $dom = new \DOMDocument;
        $state = libxml_use_internal_errors(true);
        $dom->loadHTML($string);
        libxml_use_internal_errors($state);

        $xp = new \DOMXPath($dom);
        $divNodeList = $xp->query('//div[contains(@class, "results_links_deep")]
                                    [contains(@class, "web-result")]
                               /div[contains(@class, "links_main")]
                                   [contains(@class, "links_deep")]
                                   [contains(@class, "result__body")]');

        $results = [];

        if(count($divNodeList) > 0){


            foreach ($divNodeList as $divNode) {

                $results[] = [
                    trim($xp->evaluate('string(./h2/a[@class="result__a"])', $divNode)),
                    trim($xp->evaluate('string(.//a[@class="result__snippet"])', $divNode)),
                    trim($xp->evaluate('string(.//a[@class="result__url"])', $divNode))
                ];
            }


        } 

我尝试使用以下解决方案

I tried using the solution as below

if ($crawler->filter('div#links.results')->count() > 0 ) {
    $string = $crawler->filter('div#links.results')->html()
}

然后它开始发出另一个错误，例如DOMDocument::loadHTML(): Empty string supplied as input

then it started giving another error like DOMDocument::loadHTML(): Empty string supplied as input

有什么建议吗?

推荐答案

您的filter没有返回任何结果.这就是为什么它崩溃了.这就是我通过添加try catch来解决此问题的方法.

Your filterdid not return any results. That is why it crashed. That's how I solved this issue, by adding a try catch.

try {
   $string = $crawler->filter('div#links.results')->html()
} catch (\InvalidArgumentException $e) {
    // Handle the current node list is empty..
}

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