用PHP替换图像标记周围的链接

Question

我有一个带有HTML内容的字符串(在Wordpress中),我想用另一个URL替换图像标记周围的每个链接URL:

Before: <a href="A"><img src="X"></a>
After: <a href="B"><img src="X"></a>

首先我想用正则表达式做,但后来我读到这根本不推荐.那么有可能用PHP做到这一点吗？

Answer 1

使用DOM API

$doc = new DOMDocument();
$doc->loadHTML($htmlString, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
// the flags are for if you're not using a complete document, ie an HTML fragment
// You'll need the libxml extension enabled

$xpath = new DOMXPath($doc);

// find all <a> tags with an "href" attribute and <img> child element
$links = $xpath->query('//a[@href and img]');
foreach ($links as $link) {
    $link->setAttribute('href', 'B');
}
$newHtmlString = $doc->saveHTML();

演示~ https://3v4l.org/ZHTYG