PHP:按子级内容在两个标签之间提取字符串 [英] PHP : Extracting string between two tags by childs content

问题描述

我有以下html标记:

I have this following html markup:

<ul>
    <li>
        <strong>Online:</strong>
        2/14/2010 3:40 AM
    </li>
    <li>
        <strong>Hearing Impaired:</strong>
        No
        </li>
    <li>
        <strong>Downloads:</strong>
        3,840
    </li>
</ul>

，我想从"Downloads:"的最后一个li中捕获3,840.

and I want to catch 3,840 from last li by "Downloads:".

您有什么建议?

我的尝试:

preg_match('/<li><strong>Downloads:<\/strong>(.*?)<\/li>/s', $s, $a);

推荐答案

我建议在这里使用HTML解析器，尤其是xpath.DOMDocument.

I suggest use an HTML Parser here, DOMDocument in particular with xpath.

示例:

$markup = '<ul>
    <li>
        <strong>Online:</strong>
        2/14/2010 3:40 AM
    </li>
    <li>
        <strong>Hearing Impaired:</strong>
        No
    </li>
    <li>
        <strong>Downloads:</strong>
        3,840
    </li>
</ul>';

$dom = new DOMDocument();
$dom->loadHTML($markup);
$xpath = new DOMXpath($dom);
// this just simply means get the string next on that strong tag with a text of Downloads:
$download = trim($xpath->evaluate("string(//strong[text()='Downloads:']/following-sibling::text())"));
echo $download; // 3,840

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