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PHP daddslashes 使用方法介绍

Jun 13, 2016 am 11:56 AM
magic php quotes introduce code Instructions copy Example

实例代码:

复制代码 代码如下:


@set_magic_quotes_runtime(0);
$MQG = get_magic_quotes_gpc();

if(!$MQG && $_POST) $_POST = daddslashes($_POST);
if(!$MQG && $_GET) $_GET = daddslashes($_GET);

//转译字符函数
function daddslashes($string) {
if(!is_array($string)) return addslashes($string);
foreach($string as $key => $val) $string[$key] = daddslashes($val);
return $string;
}



PHP提供两个方便我们引用数据的魔法引用函数magic_quotes_gpc和magic_quotes_runtime,这两个函数如果在php.ini设置为ON的时候,就会为我们引用的数据碰到 单引号' 和 双引号" 以及 反斜线\ 时自动加上反斜线,帮我们自动转译符号,确保数据操作的正确运行,可是我们在php不同的版本或者不同的服务器配置下,有的magic_quotes_gpc和magic_quotes_runtime设置为on,有的又是off,所以我们写的程序必须符合on和off两种情况。那么magic_quotes_gpc和magic_quotes_runtime两个函数有什么区别呢?看下面的说明:

magic_quotes_gpc和magic_quotes_runtime函数区别

magic_quotes_gpc
作用范围是:web客户
服务端;
作用时间:请求开始是,例如当脚本运行时。

magic_quotes_runtime

作用范围:从文件中读取的数据或是从SQL查询中得到的;
作用时间:每次当脚本访问运行状态中产生的数据。

所以magic_quotes_gpc的设定值将会影响通过Get/Post/Cookies获得的数据magic_quotes_runtime的设定值将会影响从文件中读取的数据或从数据库查询得到的数据

例子说明:

复制代码 代码如下:


$data1 = $_POST['aaa'];
$data2 = implode(file('1.txt'));

if(get_magic_quotes_gpc()){
//把数据$data1直接写入数据库 (自动转译)
}else{
$data1 = addslashes($data1);
//把数据$data1写入数据库,用函数(addslashes()转译)
}

if(get_magic_quotes_runtime()){
//把数据$data2直接写入数据库(自动转译)
//从数据库读出的数据要经过一次stripslashes()之后输出stripslashes()的作用是去掉:\ ,和addslashes()作用相反
}else{
$data2 = addslashes($data2);
//把数据$data2写入数据库
//从数据库读出的数据直接输出
}



最关键的区别是就是上面提到的2点:他们针对的处理对象不同
magic_quotes_gpc的设定值将会影响通过Get/Post/Cookies获得的数据
magic_quotes_runtime的设定值将会影响从文件中读取的数据或从数据库查询得到的数据

在这里顺便在提几个想关联的函数:
set_magic_quotes_runtime():
设置magic_quotes_runtime值. 0=关闭.1=打开.默认状态是关闭的.

get_magic_quotes_gpc():
查看magic_quotes_gpc值.0=关闭.1=打开

get_magic_quotes_runtime():
查看magic_quotes_runtime值。0=关闭.1=打开.

注意的是没有 set_magic_quotes_gpc()这个函数,就是不能在程序里面设置magic_quotes_gpc的值。
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