PHP using one array as keys for subarray of multidimensional array - php

Question

So i got one single dimensional array like:
Array
(
[0] => md5
[1] => name
[2] => description
[3] => url
)
and one multidimensional array:
Array
(
[0] => Array
(
[0] => md5#1
[1] => name1
[2] => desc1
[3] => url1
)
[1] => Array
(
[0] => md5#2
[1] => name2
[2] => desc2
[3] => url2
)
)
and I want to use values of first array as keys for subarrays of the multidimensional one, so the output should look like:
Array
(
[0] => Array
(
[md5] => md5#1
[name] => name1
[desription] => desc1
[url] => url1
)
[1] => Array
(
[md5] => md5#2
[name] => name2
[description] => desc2
[url] => url2
)
)
Alternatively(as a bit offtopic question), how can I sort the elements of multidimensional array by values of md5 if they keys of subarray are not [md5] but [0]?
Thanks in advance!

Answer 1

For combining values of two arrays where values of one are keys, and values of other are values, use array_combine function:
$keysArray = [];
$multiArray = [];
$result_array = [];
foreach ($multiArray as $value) {
$result_array[] = array_combine($keysArray, $value);
}
For sorting - use usort and define your custom function:
usort($result_array, function($a, $b) { return strcmp($a['md5'], $b['md5']); });

Answer 2

Here is the functional-style equivalent of #u_mulder's answer.
This technique merely applies the array of key names as the keys for every row in the array.
Using arrow function syntax (available since PHP7.4), allows the custom callback to access the globally scoped $keys array without needing to explicitly write use($keys) in the function declaration.
Code: (Demo)
$first = ['md5#1', 'name1', 'description1', 'url1'];
$second = ['md5#2', 'name2', 'description2', 'url2'];
$multidimArray = [$first, $second];
$keys = ['md5', 'name', 'description', 'url'];
var_export(
array_map(
fn($row) => array_combine($keys, $row),
$multidimArray
)
);