php去除网页copy的样式

$content= trim(str_replace("  ", ' ', $content));
$content= trim(preg_replace('/\s+/', ' ', $content));
$content = str_replace('<p > </p>', '', $content);
$content = str_replace("<p> <br /> </p>",'',$content);//去除样式
$content = str_replace("<p > <br /> </p>",'',$content);//去除样式
$content = preg_replace("/style=.+?['|\"]/i",'',$content);//去除样式
$content = preg_replace("/<h.*?>|<\/h>/is","", $content);
$content = preg_replace("/class=.+?['|\"]/i",'',$content);//去除样式
$content = preg_replace("/id=.+?['|\"]/i",'',$content);//去除样式
$content = preg_replace("/lang=.+?['|\"]/i",'',$content);//去除样式
$content = preg_replace("/width=.+?['|\"]/i",'',$content);//去除样式
$content = preg_replace("/height=.+?['|\"]/i",'',$content);//去除样式
$content = preg_replace("/border=.+?['|\"]/i",'',$content);//去除样式
$content = preg_replace("/face=.+?['|\"]/i",'',$content);//去除样式