PHP:file_get_contents('php://input')返回JSON消息的字符串 [英] PHP: file_get_contents('php://input') returning string for JSON message

问题描述

我正在尝试在我的PHP应用程序中读取JSON消息，这是我的php代码:

I am trying to read in a JSON message in my PHP app and this is my php code:

$json = file_get_contents('php://input');
$obj = json_decode($json, TRUE);
echo $obj->{'S3URL'};

执行此操作时，出现以下错误:

When I do this I am getting the following error:

Trying to get property of non-object in setImage.php on line 25 (line 25 is the echo $obj->{'S3URL'}; line)

这是页面请求的请求正文:

This is the request body of the request to the page:

Request Url: http://localhost:8888/setImage.php
Request Method: POST
Status Code: 200
Params: {
   "S3URL": "http://url.com"
}

这是请求标头:

Accept: application/json
Content-Type: application/json
Connection: keep-alive
Origin: chrome-extension: //rest-console-id
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_1) AppleWebKit/537.36 (KHTML,

但是，如果我改为回显$json变量，则会得到以下信息:

However, if I instead echo out the $json variable I get the following:

S3URL=http%3A%2F%2Furl.com

因此，看起来file_get_contents('php://input');是以字符串形式而不是以JSON形式读取它，这将使解析变得更加困难.

So it looks like file_get_contents('php://input'); is reading it in as a string, and not as JSON, which will make parsing it more difficult.

有什么主意为什么不将其作为JSON返回，或者如何将其作为JSON返回?

Any idea why it isn't being returned as JSON, or how I can get it to be returned as JSON?

推荐答案

您对json_decode的使用正在创建关联数组，而不是对象.您可以将其视为数组而不是对象.如果您想要一个对象，请改用它:

Your use of json_decode is creating an associative array, not an object. You can treat it like an array, instead of an object. If you want an object, use this, instead:

$obj = json_decode($json);

请参阅文档有关json_decode()的第二个参数:

关联 如果为TRUE，则返回的对象将转换为关联数组.

assoc When TRUE, returned objects will be converted into associative arrays.

此外，正如Johannes H.在评论中指出的那样，echo $json;的输出首先表明您实际上并没有接收到JSON，因此您也需要解决该问题.您问为什么不是JSON?没有看到您如何请求此脚本，就无法确定地说.

Also, as Johannes H. pointed out in the comments, the output of echo $json; indicates that you are not actually receiving JSON, in the first place, so you will need to address that, as well. You asked why it isn't JSON; without seeing how you are requesting this script, it's impossible to say for sure.

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