PHP Filter HTML tag attribute class

PHP Filter HTML tag attribute class

HtmlAttributeFilter.class.php

<?php/** HTML Attribute filter* date:2013-09-22* author:fdipzone* ver:1.0** func:* public strip Filter Properties * Public Setallow settings allowed properties * Public setexception Settings Exceptions * Public setignore settings ignored Tag * Private findelements search for elements to be processed * Private findattributes Search Property * Private Removeattributes Remove attribute * privat E isexception Judge If the exception is private createattributes Create attribute * Private protect special character escapes */class Htmlattributefi            lter{//class start private $_str = ';     SOURCE string Private $_allow = Array (); Allow reserved properties such as: Array (' ID ', ' class ', ' title ') Private $_exception = Array ();    Exceptions For example: Array (' A ' =>array (' href ', ' class '), ' span ' =>array (' class ')) Private $_ignore = Array ();  Ignore filtered tags such as: Array (' span ', ' img ')/** processing HTML, filtering properties not reserved * @param string $str Source String * @return String */Public        function strip ($str) {$this->_str = $str; if (is_string ($this->_str) && strlen ($thiS-&GT;_STR) {//>0) {//judgment string $this->_str = Strtolower ($this->_str);//Turn lowercase $res = $this->fi            Ndelements ();            if (is_string ($res)) {return $res;            } $nodes = $this->findattributes ($res);        $this->removeattributes ($nodes);    } return $this->_str; }/** set the allowed properties * @param Array $param */Public Function Setallow ($param =array ()) {$this->_allow = $pa    Ram }/** Set Exception * @param Array $param */Public Function setexception ($param =array ()) {$this->_exception    = $param; }/** set the ignored tag * @param Array $param */Public Function Setignore ($param =array ()) {$this->_ignore = $    Param        /** search for the element to be processed */Private Function findelements () {$nodes = array ();        Preg_match_all ("/<" ([^!\/\>\n]+) ([^>]*) >/i ", $this->_str, $elements); foreach ($elements [1] as $el _key + = $element) {if ($elements[2][$el _key]) {$literal = $elements [0][$el _key];                $element _name = $elements [1][$el _key];                $attributes = $elements [2][$el _key]; if (Is_array ($this->_ignore) &&!in_array ($element _name, $this->_ignore)) {$nodes [] = Arra                Y (' literal ' = $literal, ' name ' = $element _name, ' attributes ' + $attributes);        }}} if (! $nodes [0]) {return $this->_str;        }else{return $nodes; }}/** Search properties * @param Array $nodes The element to be processed */Private function findattributes ($nodes) {foreach ($nod Es as & $node) {Preg_match_all ("/([^ =]+) \s*=\s*[\" |] {0,1} ([^\"']*) [\"|']            {0,1}/i ", $node [' Attributes '], $attributes); if ($attributes [1]) {foreach ($attributes [1] as $att _key=> $att) {$literal = $attributes [0]                    [$att _key]; $attribute _name = $attributes [1][$att _key];                   $value = $attributes [2][$att _key];                $atts [] = Array (' literal ' = $literal, ' name ' = = $attribute _name, ' value ' = $value);            }}else{$node [' attributes '] = NULL;            } $node [' attributes '] = $atts;        Unset ($atts);    } return $nodes; /** Remove attribute * @param Array $nodes The element to be processed */Private function removeattributes ($nodes) {foreach ($nodes            As $node) {$node _name = $node [' name '];            $new _attributes = "; if (Is_array ($node [' attributes '])) {foreach ($node [' attributes '] as $attribute) {if (Is_ar Ray ($this->_allow) && in_array ($attribute [' name '], $this->_allow)) | | $this->isexception ($node _name, $attribute [' name '], $this->_exception)) {$  New_attributes = $this->createattributes ($new _attributes, $attribute [' name '], $attribute [' value '];                  }}} $replacement = ($new _attributes)?            "< $node _name $new _attributes>": "< $node _name>"; $this->_str = preg_replace ('/'. $this->protect ($node [' literal ']). '        /', $replacement, $this->_str); }}/** to determine if the exception is * @param string $element _name element name * @param string $attribute _name property name * @param Array $exc         Eptions Allowed Exceptions * @return Boolean */Private Function isexception ($element _name, $attribute _name, $exceptions) { if (array_key_exists ($element _name, $this->_exception)) {if (In_array ($attribute _name, $this->_exce            ption[$element _name]) {return true;    }} return false;     /** Create Property * @param string $new _attributes * @param string $name * @param string $value * @return string */Private Function createattributes ($new _attributes, $name, $value) {if ($new _attributes) {$new _a Ttributes.= " ";        } $new _attributes. = "$name =\" $value \ "";    return $new _attributes; /** special Character escapes * @param string $str Source String * @return String */Private Function Protect ($STR) {$convers ions = Array ("^" = "\^", "[" = "=" \[",". "=" \. "," $ "and" = "\$             "," {"=" \{"," * "and" \* "," ("=" \ "," \ \ "=" \\\\ ", "/" = "/", "+" = "\+", ")" = "\", "|" = "\|", "?        "= =" \ "," < "=" \< "," > "and" \> ");    Return Strtr ($str, $conversions); }}//Class end?>

demo

<?phprequire (' HtmlAttributeFilter.class.php '); $str = ' <p class= ' BD Clearfix "id=" Index_hilite_ul "><ul class=" list "><li><p class=" cover "><a class=" text "href=" </a>< Strong class= "T G" >want to Know</strong><a href= "/login.html" class= "ppbtn" ><strong class= "text" >YES</strong></a></p></li></ul></p> '; $obj = new Htmlattributefilter ();//  Allow ID attribute $obj->setallow (array (' ID ')), $obj->setexception (Array (' a ' = = Array (' href '),//a tag allows HREF attribute special case ' ul ' = = Array (' class ')//UL tag allows a special case of class attribute);//img tag Ignore, do not filter any attributes $obj->setignore (ARRA Y (' img ')); Echo ' source str:<br> '; Echo htmlspecialchars ($str). ' <br><br> '; Echo ' filter str:<br> '; Echo htmlspecialchars ($obj->strip ($STR));? 

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