详细代码如下： 复制代码 代码如下:<?php abstract class Filter { //filter parent class private $blackstr = array(); private $wh
详细代码如下：
复制代码 代码如下:
<?php
abstract class Filter { //filter parent class
private $blackstr = array();
private $whitestr = array();
function filtit($str) {
//do something
}
}
class LoginFilter extends Filter { //for user login filte username(过滤注册的用户名)
function filtit($str) {
$this -> blackstr = array(
´/[/x7f-/xff]/´, //filter chinese include chinese symbol
´//W/´ //filter all english symbol
);
return preg_replace($this->blackstr, ´´, $str);
}
}
class EditorFilter extends Filter { //for article editor filter(过滤在线编辑器内容)
function filtit($str) {
$this -> blackstr = array(
´//&/´,
´//´/´,
´//"/´,
´//</´,
´//>/´,
´//////´,
´////´,
´/-/´,
´//*/´,
´/ /´
);
$this -> whitestr = array(
´&´,
´'´,
´"´,
´<´,
´>´,
´\´,
´/´,
´-´,
´*´,
´ ´
);
return preg_replace($this->blackstr, $this -> whitestr, $str);
}
}
class SQLFilter extends Filter { //for filte sql query string(过滤如查询或其它sql语句)
function filtit($str) {
$this -> blackstr = array(
´//´/´,
´/-/´
);
return preg_replace($this->blackstr, ´´, $str);
}
}
class FileNameFilter extends Filter { //for filte a file name(过滤文件名如下载文件名)
function filtit($str) {
$this -> blackstr = array(
´/[^A-za-z0-9_/.]|////|/^|/[|/]/´
);
return preg_replace($this->blackstr, ´´, $str);
}
}
?>
使用方法如：
复制代码 代码如下:
$filter = new FileNameFilter(); //定义实例
$downFile = $filter->filtit($_GET[´fn´]); //调用过滤方法
