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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>"; $allowed = ['<b>', '<i>', '<u>', '<em>', '<p>', '<br>', '<table>', '<tr>', '<td>', '<th>', '<tbody>', '<thead>', '<tfoot>', '<ul>', '<li>', '<ol>', '<strong>']; preg_match_all('/<([a-zA-Z0-9]+)(\s[^>]*)?>/i', $string, $matches); array_walk($matches[1], function($tag) use ($allowed) { if (!in_array(strtolower($tag), $allowed)) { die($tag . ' is not allowed!!'); } });
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