$str=PReg_replace("/<\s*img\s+[^>]*?src\s*=\s*(\'|\")(.*?)\\1[^>]*?\/?\s*>/i", " ",$str);//过滤img标签$str=preg_replace("/\s+/", " ",$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