PHP 字符串操作 : Append html class to a string

Question

我有这个字符串:

$str = '<div class="defaultClass">...</div>';

如何在“defaultClass”后面附加“myClass”？

Answer 1

与 native DOM :

$dom = new DOMDocument;
$dom->loadHTML('<div class="defaultClass">...</div>');
$divs = $dom->getElementsByTagName('div');
foreach($divs as $div) {
    $div->setAttribute('class', 
        $div->getAttribute('class') . ' some-other-class');
}

echo $dom->saveHTML();