How Can I Efficiently Merge Two 2D PHP Arrays Based on a Shared Column Using Native Functions?

Efficiently Merging 2D Arrays Based on Shared Column Values Using Native PHP Functions

Merging multiple arrays efficiently is a common task in PHP programming. This article explores an optimal solution for merging two 2D arrays based on a shared column value without resorting to nested loops or complex procedures.

Given two sample arrays:

$array1 = [
    ['rank' => '579', 'id' => '1'],
    ['rank' => '251', 'id' => '2'],
];

$array2 = [
    ['size' => 'S', 'status' => 'A', 'id' => '1'],
    ['size' => 'L', 'status' => 'A', 'id' => '2'],
];

The goal is to merge these arrays into a new array that combines the values from each array based on the matching id values:

$mergedArray = [
    ['size' => 'S', 'status' => 'A', 'id' => '1', 'rank' => '579'],
    ['size' => 'L', 'status' => 'A', 'id' => '2', 'rank' => '251'],
];

Utilizing Native PHP Array Functions

To facilitate this merging process, PHP provides two native functions:

• array_merge_recursive(): Merges two arrays recursively, preserving the multidimensional structure.
• my_array_merge(): A custom function that loops through the arrays and merges corresponding values.

Example Code Using array_merge_recursive():

$mergedArray = array_merge_recursive($array1, $array2);

Example Code Using my_array_merge():

function my_array_merge(array &$array1, array &$array2) {
    $result = [];
    foreach ($array1 as $key => &$value) {
        $result[$key] = array_merge($value, $array2[$key]);
    }
    return $result;
}

$mergedArray = my_array_merge($array1, $array2);

Both methods effectively merge the two arrays, producing the desired output. The choice of function depends on the specific performance requirements and code clarity preferences of the developer.

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