当Content-Type为HTML时,JSON_PRETTY_PRINT无法按预期工作

Question

我动态地收到一个JSON字符串,如下所示:

{"post":[{"id":"11","body":"","image":"images/rose.png","stamp":"2013-11-04 14:50:11" }]}

我正在尝试按如下方式打印此JSON字符串:

{
    "post": [
        {
            "id": "11",
            "body": "",
            "image": "images/rose.png",
            "stamp": "2013-11-04 14:50:11"
        }
    ]
}

所以,我尝试了以下代码(仅用于演示目的):

<?php

$str = '{ "post": [ { "id": "11", "body": "", "image": "images\/rose.png", "stamp": "2013-11-04 14:50:11" } ] }';
$obj = json_decode($str);
echo json_encode($obj, JSON_PRETTY_PRINT);

它只输出未格式化的JSON字符串:

{"post":[{"id":"11","body":"","image":"images/rose.png","stamp":"2013-11-04 14:50:11" }]}

但是,当我在json_encode()语句上方添加以下行时,它会按预期工作.

header('Content-Type: text/plain');

可能导致此问题的原因是什么？为什么不工作时Content-Type是text/html？

Answer 1

JSON_PRETTY_PRINT使用空格来格式化JSON.当它显示为HTML时,将忽略空格.如果要保留格式,请将JSON包装在<pre>标记中.

例如:

<?php

$str = '{ "post": [ { "id": "11", "body": "", "image": "images\/rose.png", "stamp": "2013-11-04 14:50:11" } ] }';
$obj = json_decode($str);
$json = json_encode($obj, JSON_PRETTY_PRINT);

printf("<pre>%s</pre>", $json);

如果您不想使用<pre>标记,那么您还可以在white-space: pre包含JSON的任何元素上使用CSS属性.

Answer 2

您使用以下标头：

header('Content-Type: application/json; charset=utf-8');