如何在分区中反转PHP数组

Question

I have a simple array that looks like this:

Array (
    [0] => Array (
        [id] => 8692
        [name] => d
    )
    [1] => Array (
        [id] => 8691
        [name] => c
    )
    [2] => Array (
        [id] => 8690
        [name] => b
    )
    [3] => Array (
        [id] => 8689
        [name] => a
    )
    [4] => Array (
        [id] => 8500
        [name] => d
    )
    [5] => Array (
        [id] => 8499
        [name] => c
    )
    [6] => Array (
        [id] => 8498
        [name] => b
    )
    [7] => Array (
        [id] => 8497
        [name] => a
    )
)

This array is quite long so I only included the first 4 items to give you an idea.

My problem is that I need the array to be in a format of

a,b,c,d,a,b,c,d

At the moment the format is like:

d,c,b,a,d,c,b,a

By this I mean the ['name'] value which is either a,b,c or d.

So I every 4 items in the array need to be reversed.

I have tried to achieve this but fail every time ending up with lots of for & while loops.

Answer 1

You can do it using array_chunk, array_merge and array_reverse:

$finalArray = array();

$arrays = array_chunk($myArray, 4);

foreach ($arrays as $array) {
    $finalArray = array_merge($finalArray, array_reverse($array));
}