奇怪的字符在json内容类型的开始 [英] Weird character at start of json content type

问题描述

我正在尝试返回从MySQL服务器读取的json内容。这应该很容易，但是有一个'奇怪'的字符在内容开始时出现。

我有两个页面用于返回内容：

1. kcb433.sytes.net/as/test.php?json=true&limit=6&input=d

   
   
   

   此test.php来自Timothy Groves编写的脚本，它将数组转换为json输出




2. http://kcb433.sytes.net/k.php?k=4

   
   
   

   这个应该是做同样的

a href =http://jsonformatter.curiousconcept.com =nofollow noreferrer> jsonformatter.curiousconcept.com 但只有第1页获得验证，第2页说它不包含JSON数据。 p>

如果直接访问这两个页面没有问题。

然后我发现这个页面 jsonformat.com 并尝试了同样的事情。第一页是确定，第二页是不是，但令人惊讶的是，数据可以阅读。一目了然，

  {a：b} 
  pre> 
 
 
看起来不错，但前面有一个字符。
 
 
 
是上面的字符串的值（而不是9个值，有10个）：
   -  7B 22 61 22 3A 22 62 22 7D 
  
在第2页回应json的代码是：
  header（Content-Type：application / json）; 
 echo{\a\：\b \}; 
  
 
 
解决方案
  k.php 文件开头有 BOM签名，保存 k.php 再次使用UTF8而不使用BOM。
 
I'm trying to return json content read from MySQL server. This is supposed to be easy but, there is a 'weird' character that keeps appearing at start of the content.

I have two pages for returning content:

kcb433.sytes.net/as/test.php?json=true&limit=6&input=d

this test.php is from a script written by Timothy Groves, which converts an array to json output
http://kcb433.sytes.net/k.php?k=4

this one is supposed to do the same
I tried to validate it here jsonformatter.curiousconcept.com but just page 1 gets validated, page 2 says that it does not contain JSON data.

If accessed directly both pages has no problems. Then what is the difference, why both don't get validated?

Then I found this page jsonformat.com and tried the same thing. Page 1 was ok and page 2 wasn't but, surprisingly the data could be read. At a glance,
{"a":"b"}
may look good but there is a character in front.

According to a hex editor online, this is the value of the string above (instead of 9 values, there are 10):
-- 7B 22 61 22 3A 22 62  22 7D
The code to echo json in page 2 is:
header("Content-Type: application/json");
echo "{\"a\":\"b\"}";

解决方案
Your k.php file has BOM signature at the start, save k.php again with UTF8 without BOM.

                        
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