php实现的替换敏感字符串类实例
strfilter.class.php类文件如下：
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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); } }
// 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 ?> |
demo示例如下：
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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); ?> |
