我怎么搞砸了计算这个对象的属性？
我正在使用 domdocument() 从网页检索数据，并且我想计算匹配的数量：
$dom = new DOMDocument();
@$dom->loadHTML($output);
$xpath = new DOMXPath($dom);
$brands = $xpath->query('//li[@class="cp_item"]/a/p[1]'); // get the contents of the first paragraph inside the link
我（可能是错误的）理解是 $brands 是一个对象，其中匹配是属性。从 PHP.net 评论中，我得到以下内容作为计算对象中属性数量的方法。
$count_brands = count((array) $brands);
即使我可以看到有很多匹配，这也会产生 0
foreach ($brands as $brand) {
echo(trim($tag->nodeValue))
}
显然，我要么误解了数据的存储方式，要么误用了 count() 方法。我刚刚学习 OO PHP，所以这可能是一些愚蠢的事情。
I'm using domdocument() to retrieve data from a web page, and I want to count the number of matches:
$dom = new DOMDocument();
@$dom->loadHTML($output);
$xpath = new DOMXPath($dom);
$brands = $xpath->query('//li[@class="cp_item"]/a/p[1]'); // get the contents of the first paragraph inside the link
My (likely wrong) understanding is that $brands is an object of which the matches are properties. From PHP.net comments I get the following as a way to count the number of properties in the object.
$count_brands = count((array) $brands);
This yields 0 even though I can then see there are many matches using
foreach ($brands as $brand) {
echo(trim($tag->nodeValue))
}
Obviously I'm either misunderstanding how the data is getting stored or misapplying the count() method. I'm just learning OO PHP so it's probably something stupid.
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这个“对象”是一个 DOMNodelist 并且有一个包含数字的属性length的项目。
This "object" is a DOMNodelist and has a property length which contains the number of items.