<div class="jb51code">
<pre class="brush:PHP;">
$str=preg_replace("/\s+/"," ",$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，如javAsCript:alert(