Скачать или смотреть Recursively Rename Array Keys to dash and lower case in PHP

Learn how to efficiently transform PHP array keys by renaming them from uppercase to dash-separated lowercase in a recursive manner.
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This video is based on the question https://stackoverflow.com/q/68190329/ asked by the user 'Shaho' ( https://stackoverflow.com/u/13571872/ ) and on the answer https://stackoverflow.com/a/68190394/ provided by the user 'Nico Haase' ( https://stackoverflow.com/u/1116230/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Transforming Array Keys in PHP: A Guide to Renaming Caps to Dashes and Lower Case

When working with associative arrays in PHP, you might often face a scenario where you need to standardize the keys of your arrays. This often includes converting keys that are in camelCase or PascalCase into a format that uses lower case and dashes. This article will tackle a common problem: how to recursively rename the keys of an array so that they match a desired formatting style while preserving all sub-array keys. Let’s dive into the details!

The Problem at Hand

Imagine you have a nested array with keys in various cases and formats. The goal is to convert every key in the array to a format where uppercase letters are replaced with lower case letters, and each former capital letter is preceded by a dash – effectively converting chassisNumber into chassis-number.

Here’s a simplified version of the array you might be working with:

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

As you can see, there are multiple nested arrays within this structure. What happens if you attempt to rename the keys using a function but only see partial results?

The Initial Attempt

You might have written a function intending to traverse the array and rename the keys as follows:

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

While this function works to some extent, you’ll find that its application does not affect the keys of the nested arrays as expected. The vehicleDetails keys remain unchanged. This is a common issue but easy to fix!

The Solution: Moving Key Manipulation

The core of the issue lies within how and when the key manipulation is performed. Looking back at the if-else structure, the logic to modify the key is placed inside the else block, which means it’s only executed if $value is not an array. Consequently, the keys of nested arrays do not get updated. The solution is to move the key transformation code outside the else block and ensure it runs regardless of whether the value is an array or not.

Here’s how you can modify the function to achieve the desired result:

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

Key Changes Explained

Key Manipulation: The key is modified before we check if the value is an array.

Recursive Calls: If the value is an array, the function is called recursively to ensure all nested keys are also updated.

Testing the Function

After updating the function, you can test it on your original array to see the results of your transformation:

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

This updated function should now correctly transform all keys, including those within nested arrays, resulting in beautiful and uniform key names across your data structure!

Conclusion

Renaming array keys in PHP doesn't have to be a cumbersome task. With the right approach of key manipulation and recursion, you can easily convert your keys from a mixed case into a cleaner format that is more consistent and easier to work with. Use the function outlined here to make your PHP arrays cleaner and more professional. Happy coding!