php实现的替换敏感字符串类实例
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2022-06-02 12:27:41
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...
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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