通过发布AJAX布尔变量被视为服务器端串 [英] boolean variables posted through AJAX being treated as strings in server side

问题描述

下面是一个AJAX功能的类和包添加到会话车的一部分： -

Following is a part of an AJAX functionality to add classes and packs to session cart:-

jQuery的一部分

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");

}

Ajax请求处理PHP的一部分 -

//Checking operation and other posted parameters
if($_POST['isClass'])
{
  //Code to add class to session cart

}
else
{
  //Code to add pack to session cart
}

奇怪的

无论我通过真/假（通过调用addClassToCart（）和addPackToCart（）），总是code添加类会话车执行。
如果我把echo语句出现这样的： -

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:-

    if($_POST['isClass'])
    {
      echo "see if condition ".$_POST['isClass'];
    }
    else
    {
      echo "see else condition ".$_POST['isClass'];
    }

这是输出： -

addClassToCart（）看看状况的真实
addPackToCart（）如果看到条件为假

addClassToCart() see if condition true
addPackToCart() see if condition false

把情况是这样的jQuery的code然而正常工作： -

Putting conditions like this in the jquery code however works fine:-

function addItemToCart(itemId,isClass)
 {  
     if(isClass)
        alert("is class");
     else
        alert("is pack");
 }

最后，如果我改变了服务器端code到这一点： -

Finally, if I alter the server side code to this:-

if($_POST['isClass'] === true)
        {
          echo "see if condition ".$_POST['isClass'];
        }
        else
        {
          echo "see else condition ".$_POST['isClass'];
        }

这些都是输出 -

addClassToCart（）看别的状况的真实
addPackToCart（）看别的条件为假

addClassToCart() see else condition true
addPackToCart() see else condition false

那么，为什么是布尔变量视为字符串吗？我做得不对的发布参数？

So, why is the boolean variable treated as a string here? Am I doing something wrong in posting parameters?

谢谢， Sandeepan

Thanks, Sandeepan

推荐答案

您没有做错任何事情本身，它只是当它被发布，它看起来是这样的：

You aren't doing anything wrong per se, it's just that when it gets posted, it looks like this:

operation=add_cart&isClass=true&itemId=1234

PHP也说不清是什么数据类型，因为它不通过，它总是在POST数据只是一个字符串，因此它比作真实来做你检查，是这样的：

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:

if($_POST['isClass'] === "true")
{
  //Code to add class to session cart
}
else
{
  //Code to add pack to session cart
}

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