POST，AJAX和PHP:JSON提交 [英] POST, AJAX, and PHP : JSON submission

问题描述

好，所以这是我的JS/jQuery代码，我的rate.php文件中仅包含一个print_r($_POST).问题是，$_POST接受rated作为字符串"Array"，而不是我定义的实际数组.如何纠正此代码，以便PHP将JSON输入识别为正确的数组，而不是字符串?

Ok, so here is my JS/jQuery code, my rate.php file simply has a print_r($_POST) in it. The problem is, the $_POST is accepting rated as the string "Array", rather than the actual array as I have defined it. How do I correct this code so PHP will recognize the JSON input as a proper array, rather than a string?

var rated = {"key" : key , "value" : value};

$.ajax({
  type: "POST",
  url: $(location).attr('protocol') + "//" + $(location).attr('hostname') + "/ajax/rate.php",
  data: {
    "rated" : rated
  },
  success: function(data) {
    alert(data);
  }
});

这是我得到的输出消息:

This is the output message I'm getting:

数组 ( [评分] =>数组 )
致命错误:只有变量可以通过引用在 X
.../ajax/rate.php 中传递>

Array ( [rated] => Array )
Fatal error: Only variables can be passed by reference in .../ajax/rate.php on line X

---

实际上，rated有更多的变量，但是它们都不是数组(因此它们没有问题)，因此为了简洁起见，我将它们从上面的代码中删除了.

---

There are actually more variables that rated, but none of them are arrays (thus there isn't an issue with them), so I cut them out of the code above for brevity sake.

推荐答案

通过ajax将JSON数据传递到您的php脚本时，我建议对字符串进行JSON编码，然后在服务器端进行解析.

When passing JSON data to your php script through ajax I would recommend string encoding the JSON data and then parsing it on the server side.

var rated = {"key" : key , "value" : value};
var rated_encoded = JSON.stringify(rated);

$.ajax({
  type: "POST",
  url: $(location).attr('protocol') + "//" + $(location).attr('hostname') +     "/ajax/rate.php",
  data: {
    "rated" : rated_encoded
  },
  success: function(data) {
    alert(data);
  }
});

然后，您应该可以使用$ _POST以及任何其他标量值来访问PHP脚本中的POST变量.在服务器端拥有JSON字符串"rating_encoded"后，请使用PHP的json_decode()将其解析为关联数组.

Then you should be able to access the POST variable in your PHP script using $_POST as with any other scalar value. Once you have the JSON string 'rating_encoded' on the server-side, parse it to an associative array using PHP's json_decode().

if(isset($_POST["rated"])){
    $rated_json = $_POST["rated"];
    $JSONArray  = json_decode($rated_json, true); //returns null if not decoded
    //Values can now be accessed like standard PHP array
    if($JSONArray !== null){ 
        $key = $JSONArray["key"];
        $value = $JSONArray["value"];
    }
}    

我发现此方法对于将javascript对象数据传输到服务器(反之亦然)非常有效(使用PHP的json_encode()将PHP数组转换为有效的javascript对象)

I've found that this method is very effective for transferring javascript object data to the server and vice versa (using PHP's json_encode() to translate PHP arrays into valid javascript objects)

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