php正则过滤html标签、空格、换行符的代码(附说明)

　　复制代码 代码如下:
$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(