Скачать или смотреть How to Convert JSON Array into an Associative Array with States as Keys and Cities as Values in PHP

Learn how to efficiently transform a JSON array into an associative array in PHP, where the state abbreviations serve as keys and the respective cities as values.
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This video is based on the question https://stackoverflow.com/q/72185307/ asked by the user 'Vishal Bhatt' ( https://stackoverflow.com/u/4750224/ ) and on the answer https://stackoverflow.com/a/72185396/ provided by the user 'RiggsFolly' ( https://stackoverflow.com/u/2310830/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Transforming a JSON Array into an Associative Array in PHP

In the world of web development, chances are you'll encounter JSON – JavaScript Object Notation – as a commonly used data format for transmitting information. One of the tasks you may face when working with JSON is converting a JSON array into a PHP associative array, where specific properties become the keys and their associated values are structured accordingly.

In this guide, we’re here to tackle a specific query: How can we transform a JSON array that holds states and cities into an associative array where states are the keys, and the cities are the values?

Understanding the Problem

Let’s dive into what we’re working with. Imagine a JSON array structured as follows:

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From this array, we want to create an associative array that looks like this:

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As you can see, each state abbreviation serves as a key, and the corresponding cities are stored in an array under that key.

The Solution: Leveraging PHP for Transformation

To achieve this, we can utilize PHP’s json_decode() function to convert the JSON string into a PHP array. Then, we'll loop through this array and structure it as desired. Here’s how you can do it step-by-step:

Step 1: Convert JSON String to PHP Data Structure

Start by defining your JSON string and decoding it:

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Step 2: Initialize an Empty Array

Next, initialize an empty array to hold the redressed data:

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Step 3: Loop Over Each Item in the Array

Now, we’ll loop through each object in the decoded array and insert cities into their respective state keys:

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Step 4: Output the Result

Finally, we can print the resulting array to ensure our transformation is correct:

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Complete Code Example

Putting it all together gives us:

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Expected Output

You should see an associative array that mirrors our desired structure:

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Conclusion

And there you have it! With just a simple loop and some associative array manipulation, we successfully transformed a JSON array into a structured associative array in PHP. This approach is not only efficient but also scalable for working with larger datasets. Happy coding!