preg_replace正则过滤字符串代码

在守望的麦子上看到了这篇文章。给自己留着备用就转来了

原文地址: http://www.wheatime.com/2010/12/php-preg_replace.html

$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('aabb)

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