我们常常会用到php过滤一些标签的功能,比如过滤链接标签、过滤script标签等等,下面就介绍一下php过滤常用标签的正则表达式代码:
$str=preg_replace("/\s+/", " ", $str); //过滤多余回车 $str=preg_replace("/<[ ]+/si","<",$str); //过滤<__("<"号后面带空格) $str=preg_replace("/<\!–.*?–>/si","",$str); //注释 $str=preg_replace("/<(\!.*?)>/si","",$str); //过滤doctype $str=preg_replace("/<(/?html.*?)>/si","",$str); //过滤html标签 $str=preg_replace("/<(/?head.*?)>/si","",$str); //过滤head标签 $str=preg_replace("/<(/?meta.*?)>/si","",$str); //过滤meta标签 $str=preg_replace("/<(/?body.*?)>/si","",$str); //过滤body标签 $str=preg_replace("/<(/?link.*?)>/si","",$str); //过滤link标签 $str=preg_replace("/<(/?form.*?)>/si","",$str); //过滤form标签 $str=preg_replace("/cookie/si","cookie",$str); //过滤cookie标签 $str=preg_replace("/<(applet.*?)>(.*?)<(/applet.*?)>/si","",$str); //过滤applet标签 $str=preg_replace("/<(/?applet.*?)>/si","",$str); //过滤applet标签 $str=preg_replace("/<(style.*?)>(.*?)<(/style.*?)>/si","",$str); //过滤style标签 $str=preg_replace("/<(/?style.*?)>/si","",$str); //过滤style标签 $str=preg_replace("/<(title.*?)>(.*?)<(/title.*?)>/si","",$str); //过滤title标签 $str=preg_replace("/<(/?title.*?)>/si","",$str); //过滤title标签 $str=preg_replace("/<(object.*?)>(.*?)<(/object.*?)>/si","",$str); //过滤object标签 $str=preg_replace("/<(/?objec.*?)>/si","",$str); //过滤object标签 $str=preg_replace("/<(noframes.*?)>(.*?)<(/noframes.*?)>/si","",$str); //过滤noframes标签 $str=preg_replace("/<(/?noframes.*?)>/si","",$str); //过滤noframes标签 $str=preg_replace("/<(i?frame.*?)>(.*?)<(/i?frame.*?)>/si","",$str); //过滤frame标签 $str=preg_replace("/<(/?i?frame.*?)>/si","",$str); //过滤frame标签 $str=preg_replace("/<(script.*?)>(.*?)<(/script.*?)>/si","",$str); //过滤script标签 $str=preg_replace("/<(/?script.*?)>/si","",$str); //过滤script标签 $str=preg_replace("/javascript/si","javascript",$str); //过滤script标签 $str=preg_replace("/vbscript/si","vbscript",$str); //过滤script标签 $str=preg_replace("/on([a-z]+)\s*=/si","on\\1=",$str); //过滤script标签 $str=preg_replace("//si","&#",$str); //过滤script标签