使用PHP Simple HTML DOM解析器的奇怪错误 [英] Weird error using PHP Simple HTML DOM parser

问题描述

我正在使用此库(PHP简单HTML DOM解析器)来解析链接，这是代码:

I am using this library (PHP Simple HTML DOM parser) to parse a link, here's the code:

function getSemanticRelevantKeywords($keyword){
    $results = array();
    $html = file_get_html("http://www.semager.de/api/keyword.php?q=". urlencode($keyword) ."&lang=de&out=html&count=2&threshold=");
    foreach($html->find('span') as $e){
            $results[] = $e->plaintext;
    }
    return $results;
}

但是在输出结果时出现此错误:

but I am getting this error when I output the results:

致命错误:在非对象中调用成员函数find() /var/www/vhosts/efamous.de/subdomains/sandbox/httpdocs/getNewTrusts.php 在第25行

Fatal error: Call to a member function find() on a non-object in /var/www/vhosts/efamous.de/subdomains/sandbox/httpdocs/getNewTrusts.php on line 25

(第25行是foreach循环)，奇怪的是它(至少在表面上)正确地输出了所有内容，但我仍然遇到该错误，无法弄清原因.

(line 25 is the foreach loop), the odd thing is that it outputs everything (at least seemingly) correctly but I still get that error and can't figure out why.

推荐答案

此错误通常表示$ html不是对象.

This error usually means that $html isn't an object.

奇怪的是，您说这似乎行得通.如果输出$ html会怎样? 我以为网址不可用，而$ html为空.

It's odd that you say this seems to work. What happens if you output $html? I'd imagine that the url isn't available and that $html is null.

看起来这可能是解析器中的错误.有人提交了 bug 并添加了一个检查他的代码以解决该问题.

Looks like this may be an error in the parser. Someone has submitted a bug and added a check in his code as a workaround.

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