php 过滤html标记属性类
HtmlAttributeFilter.class.php
<?php
/**HTML Attribute Filter
*Date: 2013-09-22
*Author: fdipzone
*ver: 1.0
*
*Func:
*public strip 过滤属性
*public setAllow 设置允许的属性
*public setException 设置特例
*public setIgnore 设置忽略的标记
*private findElements 搜寻需要处理的元素
*private findAttributes 搜寻属性
*private removeAttributes 移除属性
*private isException 判断是否特例
*private createAttributes 创建属性
*private protect 特殊字符转义
*/
class HtmlAttributeFilter{ // class start
private $_str = ""; // 源字符串
private $_allow = array(); // 允许保留的属性 例如:array("id","class","title")
private $_exception = array(); // 特例 例如:array("a"=>array("href","class"),"span"=>array("class"))
private $_ignore = array(); // 忽略过滤的标记 例如:array("span","img")
/**处理HTML,过滤不保留的属性
* @param String $str 源字符串
* @return String
*/
public function strip($str){
$this->_str = $str;
if(is_string($this->_str) && strlen($this->_str)>0){ // 判断字符串
$this->_str = strtolower($this->_str); // 转成小写
$res = $this->findElements();
if(is_string($res)){
return $res;
}
$nodes = $this->findAttributes($res);
$this->removeAttributes($nodes);
}
return $this->_str;
}
/**设置允许的属性
* @param Array $param
*/
public function setAllow($param=array()){
$this->_allow = $param;
}
/**设置特例
* @param Array $param
*/
public function setException($param=array()){
$this->_exception = $param;
}
/**设置忽略的标记
* @param Array $param
*/
public function setIgnore($param=array()){
$this->_ignore = $param;
}
/**搜寻需要处理的元素 */
private function findElements(){
$nodes = array();
preg_match_all("/<([^ !/>
]+)([^>]*)>/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)){
$nodes[] = array("literal"=>$literal, "name"=>$element_name, "attributes"=>$attributes);
}
}
}
if(!$nodes[0]){
return $this->_str;
}else{
return $nodes;
}
}
/**搜寻属性
* @param Array $nodes 需要处理的元素
*/
private function findAttributes($nodes){
foreach($nodes as &$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;
}
/**移除属性
* @param Array $nodes 需要处理的元素
*/
private function removeAttributes($nodes){
foreach($nodes as $node){
$node_name = $node["name"];
$new_attributes = "";
if(is_array($node["attributes"])){
foreach($node["attributes"] as $attribute){
if((is_array($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);
}
}
/**判断是否特例
* @param String $element_name 元素名
* @param String $attribute_name 属性名
* @param Array $exceptions 允许的特例
* @return boolean
*/
private function isException($element_name, $attribute_name, $exceptions){
if(array_key_exists($element_name, $this->_exception)){
if(in_array($attribute_name, $this->_exception[$element_name])){
return true;
}
}
return false;
}
/**创建属性
* @param String $new_attributes
* @param String $name
* @param String $value
* @return String
*/
private function createAttributes($new_attributes, $name, $value){
if($new_attributes){
$new_attributes .= " ";
}
$new_attributes .= "$name="$value"";
return $new_attributes;
}
/**特殊字符转义
* @param String $str 源字符串
* @return String
*/
private function protect($str){
$conversions = array(
"^" => "^",
"[" => "[",
"." => ".",
"$" => "$",
"{" => "{",
"*" => "*",
"(" => "(",
"" => "",
"/" => "/",
"+" => "+",
")" => ")",
"|" => "|",
"?" => "?",
"<" => "<",
">" => ">"
);
return strtr($str, $conversions);
}
} // class end
?>
demo
<?php
require("HtmlAttributeFilter.class.php");
$str = "<div class="bd clearfix" id="index_hilite_ul"><ul class="list"><li><img src="http://su.bdimg.com/static/skin/img/logo_white.png" width="118" height="148"><div class="cover"><a class="text" href="http://www.csdn.net"><strong>yuna</strong><p>love</p></a><strong class="t g">want to know</strong><a href="/login.html" class="ppBtn"><strong class="text">YES</strong></a></div></li></ul></div>";
$obj = new HtmlAttributeFilter();
// 允许id属性
$obj->setAllow(array("id"));
$obj->setException(array(
"a" => array("href"), // a 标签允许有 href属性特例
"ul" => array("class") // ul 标签允许有 class属性特例
));
// img 标签忽略,不过滤任何属性
$obj->setIgnore(array("img"));
echo "source str:<br>";
echo htmlspecialchars($str)."<br><br>";
echo "filter str:<br>";
echo htmlspecialchars($obj->strip($str));
?>
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