$content = "<style>111</style><script>222</script><mip-img/>333<img/><p>sdfsf</p>";
//清除script style标签
$content = preg_replace("'<script(.*?)<\/script>'is","",$content);
$content = preg_replace("'<style(.*?)<\/style>'is","",$content);
$content = preg_replace("'<style(.*?)<\/style>'is","",$content);
//清除img标签
$content=preg_replace('/<img[^>]+>/i','',$content);
//清除所有style属性
$content = preg_replace("/style=.+?['|\"]/i",'',$content);
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