How Can I Flatten a Multi-Dimensional Array into a Single-Dimensional Array in PHP?

Turning Multi-Dimensional Array into Single Dimension

When working with multi-dimensional arrays, it can become necessary to flatten the structure into a single dimension. This can be a challenging task, especially when the array uses simple numeric keys.

To effectively flatten a multi-dimensional array, you can utilize the array_reduce() and array_merge() functions. By combining these functions, you can achieve the desired one-dimensional array.

To begin, the array_reduce() function is employed to recursively traverse the input array and apply the array_merge() function at each level. array_merge() is used to concatenate the elements from sub-arrays into a single array.

$result = array_reduce($array, 'array_merge', array());

By providing an empty array as the initial value for array_reduce(), the function will accumulate the merged elements into a new one-dimensional array.

For example, consider the following multi-dimensional array:

$array = array(
    array(1, 2, 3),
    array(4, 5, 6),
);

By utilizing the array_reduce() approach, you can obtain the flattened one-dimensional array:

$result = array(1, 2, 3, 4, 5, 6);

This method effectively converts a complex multi-dimensional array into a simplified single-dimension array, aiding in further data processing, analysis, or display.

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