我們常常會用到PHP過濾一些標(biāo)簽的功能，比如過濾鏈接標(biāo)簽、過濾script標(biāo)簽等等，下面就介紹一下PHP過濾常用標(biāo)簽的正則表達(dá)式代碼：
$str=preg_replace("/\s+/", " ", $str); //過濾多余回車
$str=preg_replace("/[ ]+/si","",$str); //過濾__(""號后面帶空格)
$str=preg_replace("/\!–.*?–>/si","",$str); //注釋
$str=preg_replace("/(\!.*?)>/si","",$str); //過濾DOCTYPE
$str=preg_replace("/(\/?html.*?)>/si","",$str); //過濾html標(biāo)簽
$str=preg_replace("/(\/?head.*?)>/si","",$str); //過濾head標(biāo)簽
$str=preg_replace("/(\/?meta.*?)>/si","",$str); //過濾meta標(biāo)簽
$str=preg_replace("/(\/?body.*?)>/si","",$str); //過濾body標(biāo)簽
$str=preg_replace("/(\/?link.*?)>/si","",$str); //過濾link標(biāo)簽
$str=preg_replace("/(\/?form.*?)>/si","",$str); //過濾form標(biāo)簽
$str=preg_replace("/cookie/si","COOKIE",$str); //過濾COOKIE標(biāo)簽
$str=preg_replace("/(applet.*?)>(.*?)(\/applet.*?)>/si","",$str); //過濾applet標(biāo)簽
$str=preg_replace("/(\/?applet.*?)>/si","",$str); //過濾applet標(biāo)簽
$str=preg_replace("/(style.*?)>(.*?)(\/style.*?)>/si","",$str); //過濾style標(biāo)簽
$str=preg_replace("/(\/?style.*?)>/si","",$str); //過濾style標(biāo)簽
$str=preg_replace("/(title.*?)>(.*?)(\/title.*?)>/si","",$str); //過濾title標(biāo)簽
$str=preg_replace("/(\/?title.*?)>/si","",$str); //過濾title標(biāo)簽
$str=preg_replace("/(object.*?)>(.*?)(\/object.*?)>/si","",$str); //過濾object標(biāo)簽
$str=preg_replace("/(\/?objec.*?)>/si","",$str); //過濾object標(biāo)簽
$str=preg_replace("/(noframes.*?)>(.*?)(\/noframes.*?)>/si","",$str); //過濾noframes標(biāo)簽
$str=preg_replace("/(\/?noframes.*?)>/si","",$str); //過濾noframes標(biāo)簽
$str=preg_replace("/(i?frame.*?)>(.*?)(\/i?frame.*?)>/si","",$str); //過濾frame標(biāo)簽
$str=preg_replace("/(\/?i?frame.*?)>/si","",$str); //過濾frame標(biāo)簽
$str=preg_replace("/(script.*?)>(.*?)(\/script.*?)>/si","",$str); //過濾script標(biāo)簽
$str=preg_replace("/(\/?script.*?)>/si","",$str); //過濾script標(biāo)簽
$str=preg_replace("/javascript/si","Javascript",$str); //過濾script標(biāo)簽
$str=preg_replace("/vbscript/si","Vbscript",$str); //過濾script標(biāo)簽
$str=preg_replace("/on([a-z]+)\s*=/si","On\\1=",$str); //過濾script標(biāo)簽
$str=preg_replace("/#/si","＃",$str); //過濾script標(biāo)簽
