Multi array in php - php

Question

i have a problem with array in php
example:
a=[1,2,3,4,5]
b=[2016, 2017, 2018, 2019, 2020]
I like to have following from a and b
c = [ [1,2016],[2,2017],[3,2018],[4,2019],[5,2020] ]
How to do that?Thank so much.

Answer 1

This code will set $c to the structure you wanted:
<?php
$a = [1,2,3,4,5];
$b = [2016, 2017, 2018, 2019, 2020];
$c = [];
foreach (array_keys($a) as $i) {
$c[] = [$a[$i], $b[$i]];
}
print_r($c);
The output is this:
Array
(
[0] => Array
(
[0] => 1
[1] => 2016
)
[1] => Array
(
[0] => 2
[1] => 2017
)
[2] => Array
(
[0] => 3
[1] => 2018
)
[3] => Array
(
[0] => 4
[1] => 2019
)
[4] => Array
(
[0] => 5
[1] => 2020
)
)
Or get it as you formatted it with json_encode($c):
[[1,2016],[2,2017],[3,2018],[4,2019],[5,2020]]

Answer 2

In case you don't like looping you can use array_merge_recursive if you do some manipulation with the arrays first.
Array_merge_recursive only works with associative arrays, so I make an array with A,B,C.. that I combine with the input arrays, this makes array_merge recursive work as expected.
The I use array_values to remove the associative keys.
Just as the other solutions, this expects equal lenghts of arrays.
$a=[1,2,3,4,5];
$b=[2016, 2017, 2018, 2019, 2020];
$keys = range("A", chr(64+count($a))); // [A,B,C,D,E]
$c = array_values(array_merge_recursive(array_combine($keys,$a),array_combine($keys,$b)));
Var_dump($c);
https://3v4l.org/qHCGI
I honestly think this is slower than looping on your arrays, maybe with a larger array times will be more equal.
This was mostly posted as "it works without looping" not as a quicker alternative.