array_merge_recursive on multidimensional array - php

Question

Please how do i apply array_merge_recursive on the code below
<?php
array:4 [▼
0 => array:1 [▼
1 => "1_1"
]
1 => array:1 [▼
1 => "1_2"
]
2 => array:1 [▼
2 => "2_1"
]
3 => array:1 [▼
2 => "2_2"
]
]
?>
I need the output to be
<?php
array:2 [▼
0 => array:2 [▼
0 => "1_1",
1 => "1_2"
]
1 => array:2 [▼
0 => "2_1",
1 => "2_2"
]
]
?>
Note: the inner array might increase from 4 to 1000
Thank you.

Answer 1

Short and to the point.
$array = [
0 => [
0 => '1_1',
],
1=> [
0 => '1_2',
],
2 => [
0 => '2_1',
],
3 => [
0 => '2_2',
],
];
foreach(array_chunk($array, 2) as $value){
print_r(array_merge(array_shift($value), array_pop($value)));
}
Get a chunk of 2 from the big array. Loop over the chunks, get the first element in the array and the last element and merge them.
Result:
Array
(
[0] => 1_1
[1] => 1_2
)
Array
(
[0] => 2_1
[1] => 2_2
)
Remove the print_r and adapt to your own needs.
array_merge_recursive can also be used instead of array_merge but it this case it does exactly the same thing. You'd still need to somehow get the chunks.