php 替换敏感字符串

PHP 批量替换敏感字符串代码

demo

<?php
header(“content-type:text/html;charset=utf8”);

require(“StrFilter.class.php”);

$white = array(‘屌丝’, ‘曹操’);
$black = array(‘屌’, ‘操’);

$content = “我操,曹操你是屌丝,我屌你啊”;

$obj = new StrFilter($white, $black);
echo $obj->replace($content);
?>

StrFilter.class.php

<?php
/** 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);
}
}

// 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

?>