StrFilter.class.php
_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
replace($content); ?>
本文讲解了如何使用php 替换敏感字符串的相关操作，更多相关内容请关注php中文网。
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