How to implement regular replacement tags in php

How to implement regular replacement tags in php: first strip the HTML tags in the string through the "strip_tags" function; then use regular expressions to replace the tags, code statements such as "pregreplace("/\s /", "",str=pregreplace("/\s /","")".

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1.strip_tags (Strip the HTML tags in the string)

strip_tags () function strips HTML, XML and PHP tags in strings.

2. String replacement

str_replace(array(" "," ","\t" ,"\r\n","\r","\n"),array("","","","","","")

3. Use regular expressions Formula (slightly less efficient)

str=pregreplace("/\s /","",str); //Filter excess carriage returns

str=pregreplace("/

str=pregreplace("//si","",str); //Comments

##str=pregreplace("/< ;(.∗?)>/si","",str); //Filter DOCTYPE

##str=pregreplace("//si","",str); //Filter html tags

##str=pregreplace("// si","",str); //Filter head tag

str=pregreplace("//si"," ",str); //Filter meta tags

##str=pregreplace("//si","",str) ; //Filter body tag

str=pregreplace("//si","",str); //Filter link tag

str=pregreplace("//si","",str); //Filter form tag

str=pregreplace("/cookie/si","COOKIE",str); //Filter COOKIE tags

str=pregreplace(" /(.*?)/si","",str); //Filter applet tags

str=pregreplace("//si","",str); //Filter applet tags

str=pregreplace("/(.∗?)/si","",str); //Filter style tag

str=pregreplace("//si","",str); //Filter style tags

str=pregreplace("/(.∗?)/si","",str); //Filter title tag

str=pregreplace("//si","",str); //Filter title Tag

##str=pregreplace("/(.∗?)/si", "",str); //Filter object tag

##str=pregreplace("//si","",str ; >/si","",str); //Filter noframes tag

##str=pregreplace("//si ","",str); //Filter noframes tag

##str=pregreplace("/(.∗?)/si","",str); //Filter frame tag

##str=pregreplace("//si","",str); //Filter frame tag

##str=pregreplace("/(.∗?)/si","",str); //Filter script tags

str=pregreplace("//si","",str); //Filter script tags

str=pregreplace("/javascript/si","Javascript",str); //Filter script tags

##str=pregreplace("/vbscript/si","Vbscript ",str); //Filter script tags

##str=pregreplace("/on([a−z] )\s∗=/si","On1=",str ); //Filter script tags

str=preg_replace("//si","",str); //Filter script tags, such as javAsCript:alert(

##str=pregreplace("//si","",str);//Match any html tag method

this−>content=pregreplace("//si","",this->content);// Filter most html tags

$str=preg_replace("/\s+/", " ",$

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