php 去除html标签 和 css样式

$content = preg_replace("/<a[^>]*>/i", "", $content);  
   $content = preg_replace("/<\/a>/i", "", $content);   
   $content = preg_replace("/<div[^>]*>/i", "", $content);  
   $content = preg_replace("/<\/div>/i", "", $content);      
     
   $content = preg_replace("/<!--[^>]*-->/i", "", $content);//注释内容  
        
   $content = preg_replace("/style=.+?['|\"]/i",'',$content);//去除样式  
   $content = preg_replace("/class=.+?['|\"]/i",'',$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   
  
   $content = preg_replace("/face=.+?['|\"]/",'',$content);//去除样式 只允许小写 正则匹配没有