json_decode无法解码JSON字符串

Question

我有一个gzip压缩的base64 JSON字符串,转换后这个字符串json_decode()无法解码它.我认为这是一个编码问题,但一直无法解决.

我正在运行PHP 5.2,它不支持json_last_error().

有谁知道这里发生了什么？

<?php 
$gzipped_base64 = "7b0HYBxJliUmL23Ke39K9UrX4HShCIBgEyTYkEAQ7MGIzeaS7B1pRyMpqyqBymVWZV1mFkDM7Z28995777333nvvvfe6O51OJ/ff/z9cZmQBbPbOStrJniGAqsgfP358Hz8ifvGv8dGv8frXaH+N7NeY/hpvf40vf43LXyP/Nepf4/zXKH+N6te4ou8e0f9f0e/4tqHff8mv8f8A";

$json = gzinflate(base64_decode($gzipped_base64));

echo $json; // prints: {"StackOverflow":"Rocks"}

$array = json_decode($json, true);

echo var_dump($array); // prints: NULL
?>

Answer 1

json_decode 期望输入是UTF-8编码的,但您的数据似乎是用UTF-16编码的:

var_export($json);

输出是:

'{' . "\0" . '"' . "\0" . 'S' . "\0" . 't' . "\0" . 'a' . "\0" . 'c' . "\0" . 'k' . "\0" . 'O' . "\0" . 'v' . "\0" . 'e' . "\0" . 'r' . "\0" . 'f' . "\0" . 'l' . "\0" . 'o' . "\0" . 'w' . "\0" . '"' . "\0" . ':' . "\0" . '"' . "\0" . 'R' . "\0" . 'o' . "\0" . 'c' . "\0" . 'k' . "\0" . 's' . "\0" . '"' . "\0" . '}' . "\0" . ''

因此,在调用之前使用mb_convert_encoding或iconv转换为UTF-8 转换字符编码json_decode.