这应该使用DOM和一个简单的XPATH查询来查找相关元素：

<?
$doc = new DOMDocument();
$doc->loadHTML($html);
$search = new DOMXPath($doc);
$results = $search->evaluate('//*[@style]');
foreach ($results as &$result)
    $result->removeAttribute('style');
$newhtml = $doc->saveHTML();
?>