Two simple pieces of PHP SQL injection prevention code_PHP tutorial

Let’s introduce two methods. First, please save the following code as safe.php in the root directory of the website, and then add include("/safe.php"); in front of each php file:

php anti-injection code method one:

<?php
//要过滤的非法字符
$ArrFiltrate=array("‘",";","union");
//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("非法字符");</script>";
		if (emptyempty($StrGoUrl))
		{
			echo "<script language="javascript">history.go(-1);</script>";
		}
		else
		{
			echo "<script language="javascript">window.location="".$StrGoUrl."";</script>";
		}
		exit;
	}
}
?>

php anti-injection code method two:

<?php
/* 过滤所有GET过来变量 */
foreach ($_GET as $get_key=>$get_var)
{
if (is_numeric($get_var)) {
$get[strtolower($get_key)] = get_int($get_var);
} else {
$get[strtolower($get_key)] = get_str($get_var);
}
}
/* 过滤所有POST过来的变量 */
foreach ($_POST as $post_key=>$post_var)
{
	if (is_numeric($post_var)) 
	{
		$post[strtolower($post_key)] = get_int($post_var);
	} 
	else 
	{
		$post[strtolower($post_key)] = get_str($post_var);
	}
}
/* 过滤函数 */
//整型过滤函数
function get_int($number)
{
	return intval($number);
}
//字符串型过滤函数
function get_str($string)
{
	if (!get_magic_quotes_gpc()) 
	{
		return addslashes($string);
	}
	return $string;
}
?>

http://www.bkjia.com/PHPjc/752508.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/752508.htmlTechArticleIntroduce two methods. First, please save the following code as safe.php and place it in the root directory of the website, and then Just add include("/safe.php"); before each PHP file: PHP anti-injection code method one:...