这篇文章主要介绍了php实现的替换敏感字符串类,包括了常见的非法字符串检测、白名单、黑名单及字符替换等功能,非常实用,需要的朋友可以参考下
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; } /**替换非法字符 * @param String $content 要替换的字符串 * @return String 替换后的字符串*/ public function replace($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:
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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