Example of replacing sensitive string class implemented in PHP_PHP tutorial

Example of replacement sensitive string class implemented by php

The StrFilter.class.php class file is as follows:

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/**string filter class * Date: 2013-01-09 * Author: fdipzone * Ver: v1.0 * * Func: * public replace Replace illegal characters * public check Check whether it contains illegal characters * private protect_white_list protection whitelist * private resume_white_list restore whitelist * private getval Convert whitelist key to 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; } /** Replace illegal characters * @param String $content The string to be replaced   * @return String     替換后的字符串    */    public function replace($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;    }        /**Check for illegal self-characters * @param String $content string * @return boolean */    public function check($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;    }        /**Protection whitelist * @param String $content string * @return String */    private function protect_white_list($content){      if($this->_white_list){        foreach($this->_white_list as $key=>$val){          $content = str_replace($val, $this->_LTAG.$key.$this->_RTAG, $content);        }      }      return $content;    }        /**Restore whitelist * @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);  ?>

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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);  ?> http://www.bkjia.com/PHPjc/882702.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/882702.htmlTechArticlephp实现的替换敏感字符串类实例 StrFilter.class.php类文件如下： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36...