Скачать или смотреть How to Sort an Array Based on Another Array in PHP

Learn how to efficiently sort one array based on the order of another array in PHP. This step-by-step guide covers array manipulation techniques and provides practical code examples.
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This video is based on the question https://stackoverflow.com/q/62532133/ asked by the user 'Hammad Khalid' ( https://stackoverflow.com/u/1069195/ ) and on the answer https://stackoverflow.com/a/62636279/ provided by the user 'Abdullah Warraich' ( https://stackoverflow.com/u/6345852/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction: The Problem of Array Sorting in PHP

Sorting arrays is a common task in programming, especially in PHP. However, sometimes we encounter scenarios where we need to sort one array based on the values of another related array. This situation often arises when we have a list of items paired with certain identifiers, such as order IDs.

In this post, we will provide a clear solution to a specific problem: we will learn how to sort one array while maintaining the relationship with the corresponding values in another array.

The Scenario

Consider the following two arrays:

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

In this case, the second array ($valuesInPair) contains order IDs that link to the names in the first array ($elementsInPairs). The goal is to sort the IDs in ascending order, which should also reflect in the arrangement of names. The desired sorted output should look like this:

Sorted IDs: [1, 2, 3, 4]
Corresponding names: ["zzz", "xxx", "yyy", "xyz"]

The Solution: Using array_multisort

To achieve this, we will use the built-in PHP function called array_multisort, which allows us to sort multiple arrays at once. This function helps maintain the links between the two arrays, ensuring that as we sort one, the other follows suit.

Step-by-Step Instructions

Prepare Your Arrays: Ensure that the arrays are defined as shown above.

Apply array_multisort: This function takes the array you want to sort, along with any additional arrays that should follow the sort order of the first array.

Here’s the code snippet to do that:

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

What Does This Do?

SORT_ASC specifies that we want to sort in ascending order.

The first argument is the array to sort ($valuesInPair) while the second argument ($elementsInPairs) will rearrange based on the sort of the first.

Final Output

After executing the above code, you will find that:

The $valuesInPair is sorted as follows:

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

And $elementsInPairs is rearranged correspondingly:

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

Conclusion: Using array_multisort for Effective Sorting

Using PHP's array_multisort function provides a clean solution for sorting arrays that are interdependent. This technique not only preserves the relationship between the values but also enhances the readability and maintainability of your code.

In summary, sorting one array based on another is efficiently managed with this approach, making it a valuable tool in your PHP programming arsenal.

Now you’re ready to tackle array sorting challenges in your PHP projects! Happy coding!