preg_replace('#font-family:[^;]+?;#i','',$str)；

preg_replace('#font-size:[^;]+?;#i','',$str)；

去除所有style

preg_replace('/style=\".*?\"/','',$str);

去除img,width,height

$txt1 = preg_replace( '/(<img.*?)(style=.+?[\'|"])|((width)=[\'"]+[0-9]+[\'"]+)|((height)=[\'"]+[0-9]+[\'"]+)/i', '$1' , $txt1);

获取文章中所有的图片

preg_match_all("/<img.*?src=[\'|\"](.*?(?:[\.gif|\.jpg|\.png|\.jpeg]))[\'|\"].*?[\/]?>/", $info['content'], $match);