php正则过滤html标签、空格、换行符的代码(附说明)

$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( 

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