在 PHP 中读取 Json/Array 字符串

问题描述

我有一个有效的 Json 格式的字符串，它看起来像这样:

I have a string which is in valid Json format and it looks like this:

{
    "message": "success",
    "result": {
        "46620": {
            "course_id": "29",
            "en_title": "Google Analytics (Basic)",
            "fa_title": "مبانی گوگل آنالیتیکز",
            "badge_link": "http://www.darsnameh.com/badge/index.php?user=46620&badge="
        },
        "49449": {
            "course_id": "16",
            "en_title": "Multimedia Reporting 1- Reporting in the Internet Age",
            "fa_title": "گزارش‌گری چندرسانه‌ای ۱- گزارشگری در زمانه‌ی اينترنت",
            "badge_link": "http://www.darsnameh.com/badge/index.php?user=49449&badge="
        },
        "55480": {
            "course_id": "33",
            "en_title": "HTML for Journalists and Bloggers",
            "fa_title": "آشنایی با اچ‌تی‌ام‌ال Ùˆ Ùناوری‌های اینترنت برای روزنامه‌نگاران Ùˆ وبلاگ‌نویس‌ها",
            "badge_link": "http://www.darsnameh.com/badge/index.php?user=55480&badge="
        },
        "59250": {
            "course_id": "31",
            "en_title": "Twitter",
            "fa_title": "توییتر",
            "badge_link": "http://www.darsnameh.com/badge/index.php?user=59250&badge="
        },
        "103716": {
            "course_id": "42",
            "en_title": "How to write a CV?",
            "fa_title": "چگونه رزومه بنویسیم؟",
            "badge_link": "http://www.darsnameh.com/badge/index.php?user=103716&badge="
        }
    }
}

我想读取不同的字段，例如所有 fa_titles，我使用 $obj = json_decode($str, true);将其转换为 Json，然后 echo sizeof($obj['result']);显示它有 5 个结果对象，但我现在如何访问 fa_title 或 en_title 字段?

I want to read different fields, for example all fa_titles, I use $obj = json_decode($str, true); to convert this to Json, then echo sizeof($obj['result']); shows me that it has 5 result object, but how can I access to fa_title or en_title fields now?

推荐答案

在 JSON 中，数组由括号([ 和 ])指定，而字典只有括号({ 和 }).

In JSON, arrays are designated by brackets ([ and ]) while dictionaries only have braces ({ and }).

您可以通过执行 $obj['result']['46620']['en_title'] 来单独访问每个结果对象.结果对象是关联数组的关联数组(也称为字典).

You could access each result object individually by doing $obj['result']['46620']['en_title'].The result object is an associative array (also known as a dictionary) of associative arrays.

您还可以使用 foreach 循环遍历每个对象，如 这个问题

You can also iterate through each object using a foreach loop, as demonstrated in this question

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