首页 / 网页编程 / PHP / 替换敏感字符串的php代码

<？php/** string filter class * Date: 2013-01-09 * Author: fdipzone * Ver:v1.0 * * Func: * publicreplace替换非法字符 * publiccheck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 startprivate $_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 * @paramString $content 要替換的字符串 * @return String替換后的字符串 */public function replace（$content）{if（！isset（$content） || $content==""）{return "";}// protect white list$content = $this->protect_white_list（$content）;// replace black listif（$this->_black_list）{foreach（$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 * @paramString $content 字符串 * @return boolean */public function check（$content）{if（！isset（$content） || $content==""）{return true;}// protect white list$content = $this->protect_white_list（$content）;// checkif（$this->_black_list）{foreach（$this->_black_list as $val）{if（strstr（$content, $val）！=""）{return false;}}}return true;}/** 保护白名单 * @paramString $content 字符串 * @return String */private function protect_white_list（$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 * @paramString $content * @return String */private function resume_white_list（$content）{if（$this->_white_list）{$content = preg_replace_callback（"/[[##（.*？）##]].*？/si", array（$this, "getval"）, $content）;}return $content;}/** 白名单 key还原为value * @paramArray$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？>

<？phpheader（"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）;？>