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
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