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<?php function validate($value): void { $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', $value, $matches); $invalidTags = array_filter($matches[1], fn ($tag) => !in_array(strtolower($tag), $allowed)); if (!empty($invalidTags)) { print_r($invalidTags); } } validate('Hey <a href="">Link</a>');
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