简单实用的PHP防注入类实例

<?php
/**
 * 参数处理类
 * @author JasonWei
 */
class Params
{
    public $get = array();
 
    public $post = array();
 
    function __construct()
    {
 if (!emptyempty($_GET)) {
     foreach ($_GET as $key => $val) {
 if (is_numeric($val)) {
     $this->get[$key] = $this->getInt($val);
 } else {
     $this->get[$key] = $this->getStr($val);
 }
     }
 }
 if (!emptyempty($_POST)) {
     foreach ($_POST as $key => $val) {
 if (is_numeric($val)) {
     $this->post[$key] = $this->getInt($val);
 } else {
     $this->post[$key] = $this->getStr($val);
 }
     }
 }
    }
 
    public function getInt($number)
    {
 return intval($number);
    }
 
    public function getStr($string)
    {
 if (!get_magic_quotes_gpc()) {
     $string = addslashes($string);
 }
 return $string;
    }
 
    public function checkInject($string)
    {
 return eregi('select|insert|update|delete|/*|*|../|./|union|into|load_file|outfile', $string);
    }
 
    public function verifyId($id = null)
    {
 if (!$id || $this->checkInject($id) || !is_numeric($id)) {
     $id = false;
 } else {
     $id = intval($id);
 }
 return $id;
    }
}
?>

<?php 
/*************************  
说明：    
判断传递的变量中是否含有非法字符    
   
如$_POST、$_GET    
功能：    
防注入    
*************************/    
//要过滤的非法字符     
$ArrFiltrate=array("'","or","and","union","where");     
//出错后要跳转的url,不填则默认前一页     
$StrGoUrl="";     
//是否存在数组中的值     
function FunStringExist($StrFiltrate,$ArrFiltrate){     
foreach ($ArrFiltrate as $key=>$value){     
if (eregi($value,$StrFiltrate)){     
  return true;     
}     
}     
return false;     
}     
//合并$_POST 和 $_GET     
if(function_exists(array_merge)){     
$ArrPostAndGet=array_merge($HTTP_POST_VARS,$HTTP_GET_VARS);     
}else{     
foreach($HTTP_POST_VARS as $key=>$value){     
$ArrPostAndGet[]=$value;     
}     
foreach($HTTP_GET_VARS as $key=>$value){     
$ArrPostAndGet[]=$value;     
}     
}     
//验证开始     
foreach($ArrPostAndGet as $key=>$value){     
if (FunStringExist($value,$ArrFiltrate)){     
echo "<script language='javascript'>alert('传递的信息中不得包含{',or,and,union}等非法字符请您把他们换成{‘,ＯＲ,ＡＮＤ,ＵＮＩＯＮ}');</script>";     
if (emptyempty($StrGoUrl)){     
echo "<scriptlanguage='javascript'>history.go(-1);</script>";     
}else{     
echo "<scriptlanguage='javascript'>window.location='".$StrGoUrl."';</script>";     
}     
exit;     
}     
}     
/***************结束防止PHP注入*****************/    
?>