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Example of replacing sensitive string class implemented in PHP_PHP tutorial

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Release: 2016-07-13 10:18:47
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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...
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