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<?php $string = "<h1>Hello, <b>World!</b></h1> <p>This is a <a href='#'>link</a>. <img src='image.jpg' /></p>"; $whitelist = ['b', 'a', 'p', 'img']; preg_match_all('/<([a-zA-Z0-9]+)(\s[^>]*)?>/i', $string, $matches); $validTags = array_filter($matches[1], function($tag) use ($whitelist) { return in_array(strtolower($tag), $whitelist); }); print_r($validTags);
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