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/** string filter class
* Date:2013-01-09
* Author:fdipzone
* Ver:v1.0
*
* Func:
* public replace替换非法字符
* public check检查是否含有非法字符
* private protect_white_list 保护白名单
* private resume_white_list 还原白名单
* private getval白名单 key转为value
*/
class StrFilter{ // class start
private $_white_list = array();
private $_black_list = array();
private $_replacement = '*';
private $_LTAG = '[[##';
private $_RTAG = '##]]';
/**
* @param Array $white_list
* @param Array $black_list
* @param String $replacement
*/
public function __construct($white_list=array(), $black_list=array(), $replacement='*'){
$this->_white_list = $white_list;
$this->_black_list = $black_list;
$this->_replacement = $replacement;
}/** 替换非法字符
* @param String $content 要替換的字符串
* @return String替換后的字符串
*/
public function replace($content){if(!isset($content) || $content==''){
return '';
}// protect white list
$content = $this->protect_white_list($content);
// replace black list
if($this->_black_list){
foreach($this->_black_list as $val){
$content = str_replace($val, $this->_replacement, $content);
}
}
return $content;
// resume white list
$content = $this->resume_white_list($content);
return $content;
}/** 检查是否含有非法自符
* @param String $content 字符串
* @return boolean
*/
public function check($content){if(!isset($content) || $content==''){
return true;
}// protect white list
$content = $this->protect_white_list($content);
// check
if($this->_black_list){
foreach($this->_black_list as $val){
if(strstr($content, $val)!=''){
return false;
}
}
}
return true;
}/** 保护白名单
* @param String $content 字符串
* @return String
*/
private function protect_white_list($content){
if($this->_white_list){
foreach($this->_white_list as $key=>$val){
$content = str_replace($val, $this->_LTAG.$key.$this->_RTAG, $content);
}
}
return $content;
}/** 还原白名单
* @param String $content
* @return String
*/
private function resume_white_list($content){
if($this->_white_list){
$content = preg_replace_callback("/\[\[##(.*?)##\]\].*?/si", array($this, 'getval'), $content);
}
return $content;
}/** 白名单 key还原为value
* @param Array $matches 匹配white_list的key
* @return String white_list val
*/
private function getval($matches){
return isset($this->_white_list[$matches[1]])? $this->_white_list[$matches[1]] : '';
// key->val
}
} // class end
header("content-type:text/html;
charset=utf8");
$white = array('屌丝', '曹操','');
$black = array('屌', '操');
$content = "我操,曹操你是屌丝,我屌你啊，毛你好";
$obj = new StrFilter($white, $black);
echo $obj->check($content);
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