Скачать или смотреть How to Dynamically Insert Key-Value Pairs in Nested JSON Arrays Using PHP recursion

A step-by-step guide for PHP developers on how to add key-value pairs to nested JSON arrays using recursive functions. Discover sample code and tips to simplify your coding journey!
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This video is based on the question https://stackoverflow.com/q/67947494/ asked by the user 'Kabir Ul Althamash' ( https://stackoverflow.com/u/4911440/ ) and on the answer https://stackoverflow.com/a/67947742/ provided by the user 'Riddhish' ( https://stackoverflow.com/u/3313096/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem

Working with nested JSON structures can be challenging, especially when you need to insert new key-value pairs dynamically into every child object. In this guide, we will address a scenario where you have a nested JSON array, and your objective is to add a peopleCount key to each object, which may be influenced by an API call.

The JSON Structure

Here’s the initial structure of our JSON array:

[[See Video to Reveal this Text or Code Snippet]]

In this structure, each parent object contains a children key that holds an array of nested objects. We want to append a new key-value pair, peopleCount, to each object within this nested setup.

The Solution

The powers of recursion can solve our problem efficiently. By employing a recursive function, we can traverse through all levels of the JSON array and add our desired key-value pair. Below is a step-by-step breakdown of how to implement this solution:

Step 1: Define the Recursive Function

We'll create a function called print_data that accepts the JSON array as a reference. This allows us to modify the array while traversing through it.

Sample PHP Code

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Key Points:

Reference Parameters: The ampersand (&) before the variable in the function definition allows us to modify the original array rather than a copy.

Checking for Children: The function checks if the current object has a children array and calls itself recursively.

Step 2: Execute the Function

When you run the code, you will traverse the entire structure. Each object will receive a peopleCount field set to 123 (or whatever your API call returns), like so:

Expected Output

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Conclusion

Adding new key-value pairs to a nested JSON array in PHP using recursion is not only efficient but also effective in managing complex data structures. By following the outlined method, you can easily insert dynamic data into your JSON objects. This technique is especially useful when dealing with APIs, where you might need to update your data on the fly based on external inputs.

Feel free to incorporate your own logic in fetching the peopleCount from an API or any other source to make your application robust and dynamic!

If you have any questions or need further clarification, please leave your comments below!