json_encode为UTF-8字符集返回null [英] json_encode returning null for UTF-8 charset

问题描述

我有一个像这样的json文件

I have a json file like this

{"downloads":[
    {
        "url":"arquivo1.pdf",
        "descricao":"árquivo 1"
    },
    {
        "url":"arquivo2.pdf",
        "descricao":"arquivo 2"
    }
]}

然后我通过 Notepad ++ 使用 UTF-8编码保存它.

And I save it using UTF-8 encode via Notepad++.

然后我得到文件内容:

function getContent($name)
{
    $content = file_get_contents("configs/" . $name . ".json");
    $encoded = utf8_encode($content);
    return json_decode($encoded);
}

和json_decode返回null.

如果我将json文件另存为ANSI，那么它将起作用.但我想将其另存为UTF-8.

If I save the json file as ANSI then it works. But I'd like to save it as UTF-8.

推荐答案

我怀疑初始文件已采用UTF-8格式或格式错误.

I suspect that the initial file is either already in UTF-8 or in a badly formatted type.

如果无法解码json或编码的数据深于递归限制，则返回

NULL .

NULL is returned if the json cannot be decoded or if the encoded data is deeper than the recursion limit.

编码错误

您可以通过执行以下操作来检查您的输入内容是否已经是有效的utf-8:

You can check if your input content is already valid utf-8 by doing this:

$is_valid_utf8 = mb_check_encoding($content, 'utf-8'));

如果是，请勿对其进行重新编码.

If it is, don't re-encode it.

文档提供了更多内容: http://php.net/mb-check-encoding

The documentation has more to offer: http://php.net/mb-check-encoding

BOM

或者Notepad ++设置的BOM可能会混淆json_decode.

Or maybe Notepad++ sets a BOM which could confuse json_decode.

//Remove UTF-8 BOM if present, json_decode() does not like it.
if(substr($content, 0, 3) == pack("CCC", 0xEF, 0xBB, 0xBF)) {
    $content = substr($content, 3);
}

请参见 json_decode 的文档.

see json_decode's documentation.

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