php实现的替换敏感字符串类实例

本文实例讲述了php实现的替换敏感字符串类及其用法，在php程序开发中有着非常广泛的应用价值。分享给大家供大家参考。具体方法如下：

StrFilter.class.php类文件如下：

_white_list = $white_list; 
    $this->_black_list = $black_list; 
    $this->_replacement = $replacement; 
  } 
 
   
  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; 
  } 
 
   
  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; 
  } 
 
   
  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; 
  } 
 
   
  private function resume_white_list($content){ 
    if($this->_white_list){ 
      $content = preg_replace_callback("/[[##(.*?)##]].*?/si", array($this, 'getval'), $content); 
    } 
    return $content; 
  } 
 
   
  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：

replace($content); 
?>

完整实例代码点击本站下载

希望本文所述对大家php程序设计的学习有所帮助。