如何使用PHP DOMDocument计算特定类的div [英] How to count div of a specific class using PHP DOMDocument

问题描述

我有一个html字符串

I have a html string

html_string = '<div class="quote" post_id="48" 
style="border:1px solid #000;padding:15px;margin:15px;" user_id="1"
user_name="rashidfarooq">This is not True</div>

<div class="quote" post_id="49" style="border:1px 
solid #000;padding:15px;margin:15px;" user_id="1" 
user_name="rashidfarooq">This is good for me</div>

<div class="genuine" post_id="49" style="border:1px 
solid #000;padding:15px;margin:15px;" user_id="1" 
user_name="rashidfarooq">This is good for me</div>';

我想算出我尝试过的类名= quote
的div

I want to count the div having class name = "quote" I have tried

    $dom = new DOMDocument;
    $dom->loadHTML($html_string);
    $divs = $dom->getElementsByTagName('div');
    $length = $divs->length;

但是$ length给出了div的总数。我如何只计数具有类名称= quote的div。有任何PHP本机函数可以做到这一点。

But the $length gives the total number of divs. How can I count only the divs having class name = "quote". Is there any PHP Native function that can do that.

推荐答案

似乎没有本机的domdocument函数，但这是自己写起来很容易：

There doesnt seem to be a native domdocument function for that, but it's easy to write it yourself:

function getElementsByClassName($elements, $className) {
    $matches = array();
    foreach($elements as $element) {
        if (!$element->hasAttribute('class')) {
            continue;
        }
        $classes = preg_split('/\s+/', $element->getAttribute('class'));
        if ( ! in_array($className, $classes)) {
            continue;
        }
        $matches[] = $element;
    }
    return $matches;
}

$dom = new DOMDocument;
$dom->loadHTML($html_string);
$divs = getElementsByClassName($dom->getElementsByTagName('div'), 'quote');
$length = $divs->length;

这篇关于如何使用PHP DOMDocument计算特定类的div的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！