PHP implementation filter Various HTML tags _php tutorial

PHP implementation filters various HTML tags

In the process of doing the project, we often need to filter some HTML tags to improve the security of the data, in fact, is to remove those potentially harmful to the application of data. It is used to remove tags and remove or encode unwanted characters.

First share some of the more common

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$str =preg_replace ("/ ]*?srcs*=s* (' |") (.*?) \1[^>]*?/?s*>/i "," ", $str); Filter img Tags $str =preg_replace ("/s+/", "", $str); Filter Excess Return $str =preg_replace ("/<[]+/si", "<", $str); Filter <__ (with spaces behind the "<" sign) $str =preg_replace ("/ /si", "", $str);//Comments $str =preg_replace ("/< (!. *?) >/si "," ", $str); Filter DOCTYPE $str =preg_replace ("/< (/?html.*?) >/si "," ", $str); Filter HTML Tags $str =preg_replace ("/< (/?head.*?) >/si "," ", $str); Filter head Tags $str =preg_replace ("/< (/?meta.*?) >/si "," ", $str); Filter META Tags $str =preg_replace ("/< (/?body.*?) >/si "," ", $str); Filter Body Tags $str =preg_replace ("/< (/?link.*?) >/si "," ", $str); Filter Link Tags $str =preg_replace ("/< (/?form.*?) >/si "," ", $str); Filter form Labels $str =preg_replace ("/cookie/si", "Cookie", $str); Filter Cookie Tags $str =preg_replace ("/< (applet.*?) > (. *?) < (/applet.*?) >/si "," ", $str); Filter applet Tags $str =preg_replace ("/< (/?applet.*?) >/si "," ", $str); Filter applet Tags $str =preg_replace ("/< (style.*?) > (. *?) < (/style.*?) >/si "," ", $str); Filter style Labels $str =preg_replace ("/< (/?style.*?) >/si "," ", $str); Filter style Labels $str =preg_replace ("/< (title.*?) > (. *?) < (/title.*?) >/si "," ", $str); Filter title Tags $str =preg_replace ("/< (/?title.*?) >/si "," ", $str); Filter title Tags $str =preg_replace ("/< (object.*?) > (. *?) < (/object.*?) >/si "," ", $str); Filter Object Tags $str =preg_replace ("/< (/?objec.*?) >/si "," ", $str); Filter Object Tags $str =preg_replace ("/< (noframes.*?) > (. *?) < (/noframes.*?) >/si "," ", $str); Filter Noframes Labels $str =preg_replace ("/< (/?noframes.*?) >/si "," ", $str); Filter Noframes Labels $str =preg_replace ("/< (i?frame.*?) > (. *?) < (/i?frame.*?) >/si "," ", $str); Filter Frame Tags $str =preg_replace ("/< (/?i?frame.*?) >/si "," ", $str); Filter Frame Tags $str =preg_replace ("/< (script.*?) > (. *?) < (/script.*?) >/si "," ", $str); Filter script Tags $str =preg_replace ("/< (/?script.*?) >/si "," ", $str); Filter script Tags $str =preg_replace ("/javascript/si", "JavaScript", $STR); Filter script Tags $str =preg_replace ("/vbscript/si", "VBScript", $STR); Filter script Tags $str =preg_replace ("/on ([a-z]+) S*=/si", "on\1=", $str); Filter script Tags $str =preg_replace ("/&#/si", "a", $str); Filter script Tags

A simpler notation:

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function delhtml ($STR) {//Clear HTML tags $st =-1; Begin $et =-1; End $stmp =array (); $stmp []= ""; $len =strlen ($STR); for ($i =0; $i < $len; $i + +) { $ss =substr ($str, $i, 1); if (Ord ($SS) ==60) {//ord ("<") ==60 $st = $i; } if (Ord ($SS) ==62) {//ord (">") ==62 $et = $i; if ($st!=-1) { $stmp []=substr ($str, $st, $et-$st + 1); } } } $str =str_replace ($stmp, "", $str); return $str; }

One more:

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function Clear_html_label ($html) { $search = Array ("' Si '," ' <[/! ') *? [^<>]*?> ' si ', "' ([RN]) [s]+ '", "' & (quot| #34); ' I "," ' & (amp| #38); ' I "," ' & (lt| #60); ' I "," ' & (gt| #62); ' I "," ' & (nbsp| #160); ' I "," ' & (iexcl| #161); ' I "," ' & (cent| #162); ' I "," ' & (pound| #163); ' I "," ' & (copy| #169); ' I "," ' "(d+); E "); $replace = Array ("", "", "1", "" "," & "," < "," > "," ", Chr (161), Chr (162), Chr (163), Chr (169)," Chr (1) "); Return Preg_replace ($search, $replace, $html); }

The above three kinds of methods can be achieved, but each has advantages and disadvantages, small partners according to their own project needs to choose it.

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