php 通过 AJAX 发布的布尔变量在服务器端被视为字符串
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boolean variables posted through AJAX being treated as strings in server side
提问by Sandeepan Nath
Following is a part of an AJAX functionality to add classes and packs to session cart:-
以下是将类和包添加到会话购物车的 AJAX 功能的一部分：-
The jquery part
jquery部分
function addClassToCart(itemId)
{
addItemToCart(itemId,true);
}
function addPackToCart(itemId)
{
addItemToCart(itemId,false);
}
function addItemToCart(itemId,isClass)
{
$.post(url+"/ajax/add_cart", { operation: 'add_cart','isClass':isClass, 'itemId': itemId},
function(data)
{
if(data.success)
{
alert("item added to cart");
}
}, "json");
}
The AJAX request processing php part -
AJAX请求处理php部分——
//Checking operation and other posted parameters
if($_POST['isClass'])
{
//Code to add class to session cart
}
else
{
//Code to add pack to session cart
}
The strange thing
奇怪的事
No matter whether I pass true/false (by calling addClassToCart() and addPackToCart()), always the code to add class to session cart executes.
If I put echo statements there like this:-
无论我是否通过 true/false（通过调用 addClassToCart() 和 addPackToCart()），将类添加到会话购物车的代码总是会执行。
如果我像这样把 echo 语句放在那里：-
if($_POST['isClass'])
{
echo "see if condition ".$_POST['isClass'];
}
else
{
echo "see else condition ".$_POST['isClass'];
}
This is the output:-
这是输出：-
addClassToCart() see if condition true
addPackToCart() see if condition false
addClassToCart() see if condition true
addPackToCart() see if condition false
Putting conditions like this in the jquery code however works fine:-
将这样的条件放在 jquery 代码中，但效果很好：-
function addItemToCart(itemId,isClass)
{
if(isClass)
alert("is class");
else
alert("is pack");
}
Finally, if I alter the server side code to this:-
最后，如果我将服务器端代码更改为：-
if($_POST['isClass'] === true)
{
echo "see if condition ".$_POST['isClass'];
}
else
{
echo "see else condition ".$_POST['isClass'];
}
These are the outputs -
这些是输出 -
addClassToCart() see else condition true
addPackToCart() see else condition false
addClassToCart() see else condition true
addPackToCart() see else condition false
So, why is the boolean variable treated as a string here? Am I doing something wrong in posting parameters?
那么，为什么布尔变量在这里被视为字符串呢？我在发布参数时做错了什么吗？
Thanks, Sandeepan
谢谢，桑迪潘
回答by Tamara
Also you can use filter_var function with filter FILTER_VALIDATE_BOOLEAN. According to php documentation it
您也可以将 filter_var 函数与过滤器 FILTER_VALIDATE_BOOLEAN 一起使用。根据php文档它
Returns TRUE for "1", "true", "on" and "yes". Returns FALSE otherwise. If FILTER_NULL_ON_FAILURE is set, FALSE is returned only for "0", "false", "off", "no", and "", and NULL is returned for all non-boolean values.
为“1”、“true”、“on”和“yes”返回 TRUE。否则返回 FALSE。如果设置了 FILTER_NULL_ON_FAILURE，则仅对“0”、“false”、“off”、“no”和“”返回 FALSE，对所有非布尔值返回 NULL。
So receiving of POST parameter will look like:
所以接收 POST 参数将如下所示：
$isClass = filter_var ($_POST['isClass'], FILTER_VALIDATE_BOOLEAN);
回答by Nick Craver
You aren't doing anything wrong per se, it's just that when it gets posted, it looks like this:
你本身并没有做错什么，只是当它被发布时，它看起来像这样：
operation=add_cart&isClass=true&itemId=1234
PHP can't tell what the data type is because it isn't passed, it's always just a string of POST data, so compare it to "true"to do your checks, like this:
PHP 无法判断数据类型是什么，因为它没有传递，它始终只是一串 POST 数据，因此将其与"true"进行比较以进行检查，如下所示：
if($_POST['isClass'] === "true")
{
//Code to add class to session cart
}
else
{
//Code to add pack to session cart
}
回答by Sam Dufel
This is a bit of an old question, but I'm surprised nobody has posted this here as solution.
这是一个老问题，但我很惊讶没有人在这里发布这个作为解决方案。
Just use 1 and 0 instead of true and false when you're constructing your ajax requests.
When you do a ==comparison, they'll be interpreted as true/false.
在构建 ajax 请求时，只需使用 1 和 0 而不是 true 和 false。当您进行==比较时，它们将被解释为真/假。
JS:
JS：
$.ajax({
url: '....',
data: {
foo: 1,
bar: 0
}
});
PHP:
PHP：
<?php
if ($_GET['foo']) {
//...
} else {
//...
}
echo $_GET['bar'] ? 'bar is true' : 'bar is false';
?>
回答by OIS
- Send the data from your javascript as stringified JSON.
- Make a PHP function to convert the strings 'true' and 'false' to boolean value.
- 将 javascript 中的数据作为字符串化 JSON 发送。
- 制作一个 PHP 函数来将字符串 'true' 和 'false' 转换为布尔值。
Personally I like #2, which goes with Nick Craver's answer.
我个人喜欢#2，这与 Nick Craver 的回答相符。
