How to Flatten a Multidimensional Array in PHP?

Flattening Multidimensional Arrays into One Dimension

Converting a multidimensional array with numeric keys into a one-dimensional array can be a daunting task. To simplify this process, we present a reliable solution.

To flatten the multidimensional array, we utilize array_reduce() with the array_merge callback function. array_reduce() accumulates an array by iteratively applying the callback function to each element in the original array, passing along an accumulator value.

In our case, we pass the array_merge callback, which combines two arrays into a single array. The initial accumulator value is set as an empty array.

array_reduce($array, 'array_merge', array())

Here's an example to illustrate this solution:

$array = array(
    array('foo', 'bar', 'hello'),
    array('world', 'love'),
    array('stack', 'overflow', 'yep', 'man'),
);
$result = array_reduce($array, 'array_merge', array());

The resulting array, $result, will be:

array('foo', 'bar', 'hello', 'world', 'love', 'stack', 'overflow', 'yep', 'man');

This approach provides a concise and straightforward way to flatten multidimensional arrays with numeric keys into a one-dimensional structure.

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