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:
<?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
?>
demo示例如下:
<?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); ?>
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。
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