php正则替换标签的实现方法：首先通过“strip_tags”函数剥去字符串中的HTML标签；然后利用正则表达式替换标签，代码语句如“pregreplace("/\\\\s /","",str=pregreplace("/\\\\s /","")”。
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1.strip_tags(剥去字符串中的 HTML 标签)
strip_tags() 函数剥去字符串中的 HTML、XML 以及 PHP 的标签。
2.字符串替换
str_replace(array(“ ”,” ”,”\\\\t”,”\\\\r\\\\n”,”\\\\r”,”\\\\n”),array(“”,”“,”“,”“,”“,”“)
3.利用正则表达式(效率稍微低一些)
str=pregreplace("/\\\\s /","",str); //过滤多余回车
str=pregreplace("/<[] /si","<",str); //过滤<__(“<”号后面带空格)
str=pregreplace("/<??.????>/si","",str); //注释
str=pregreplace("/<(.??)>/si","",str); //过滤DOCTYPE
str=pregreplace("/<(\\\\/?html.??)>/si","",str); //过滤html标签
str=pregreplace("/<(\\\\/?head.??)>/si","",str); //过滤head标签
str=pregreplace("/<(\\\\/?meta.??)>/si","",str); //过滤meta标签
str=pregreplace("/<(\\\\/?body.??)>/si","",str); //过滤body标签
str=pregreplace("/<(\\\\/?link.??)>/si","",str); //过滤link标签
str=pregreplace("/<(\\\\/?form.??)>/si","",str); //过滤form标签
str=pregreplace("/cookie/si","COOKIE",str); //过滤COOKIE标签
str=pregreplace("/<(applet.??)>(.??)<(\\\\/applet.??)>/si","",str); //过滤applet标签
str=pregreplace("/<(\\\\/?applet.??)>/si","",str); //过滤applet标签
str=pregreplace("/<(style.??)>(.??)<(\\\\/style.??)>/si","",str); //过滤style标签
str=pregreplace("/<(\\\\/?style.??)>/si","",str); //过滤style标签
str=pregreplace("/<(title.??)>(.??)<(\\\\/title.??)>/si","",str); //过滤title标签
str=pregreplace("/<(\\\\/?title.??)>/si","",str); //过滤title标签
str=pregreplace("/<(object.??)>(.??)<(\\\\/object.??)>/si","",str); //过滤object标签
str=pregreplace("/<(\\\\/?objec.??)>/si","",str); //过滤object标签
str=pregreplace("/<(noframes.??)>(.??)<(\\\\/noframes.??)>/si","",str); //过滤noframes标签
str=pregreplace("/<(\\\\/?noframes.??)>/si","",str); //过滤noframes标签
str=pregreplace("/<(i?frame.??)>(.??)<(\\\\/i?frame.??)>/si","",str); //过滤frame标签
str=pregreplace("/<(\\\\/?i?frame.??)>/si","",str); //过滤frame标签
str=pregreplace("/<(script.??)>(.??)<(\\\\/script.??)>/si","",str); //过滤script标签
str=pregreplace("/<(\\\\/?script.??)>/si","",str); //过滤script标签
str=pregreplace("/javascript/si","Javascript",str); //过滤script标签
str=pregreplace("/vbscript/si","Vbscript",str); //过滤script标签
str=pregreplace("/on([a?z] )\\\\s?=/si","On1=",str); //过滤script标签
str=preg_replace("/&#/si","&＃",str); //过滤script标签，如javAsCript:alert(
str=pregreplace("/<(\\\\/?.??)>/si","",str);//匹配任意html标签方式
this?>content=pregreplace("/<(\\\\/?.??)>/si","",this->content);//过滤大多数的html标签
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