php正则替换标签的实现方法

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(“ ”,” ”,” ”,”
”,””,”
”),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