StrFilter.class.php類文件如下：

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<?php

/** string filter class

* Date: 2013-01-09

* Author: fdipzone

* Ver: v1.0

*

* Func:

* public replace 替換非法字符

* public check 檢查是否含有非法字符

* private protect_white_list 保護白名單

* private resume_white_list 還原白名單

* private getval 白名單 key轉(zhuǎn)為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;

}

/** 替換非法字符

* @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);

}

}

// resume white list

$content = $this->resume_white_list($content);

return $content;

}

/** 檢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;

}

/** 保護白名單

* @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;

}

/** 還原白名單

* @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;

}

/** 白名單 key還原為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

?>

demo示例如下：

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<?php

header("content-type:text/html;charset=utf8");

require("StrFilter.class.php");

$white = array('屌絲', '曹操');

$black = array('屌', '操');

$content = "我操,曹操你是屌絲,我屌你啊";

$obj = new StrFilter($white, $black);

echo $obj->replace($content);

?>

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