sort an array with another array which has sorted keys

Question

How to sort an 1st array with 2nd array which has sorted keys in 2nd array without using any loop.

1st Array.

$chunk = array(
                [0] => Array
                    (
                        [id] => 212
                        [order] => 1
                        [title] => fdfdfdfdf
                    )

                [1] => Array
                    (
                        [id] => 5
                        [order] => 2
                        [title] => 
                    )

                [2] => Array
                    (
                        [id] => 781
                        [order] => 3
                        [title] => 
                    )
            )

2nd array with sorted keys of 1st array.

$sort = array
    (
        [2] => 2
        [0] => 0
        [1] => 1
    )

Answer 1

You could use array_map for that:

$arr = array_map(function($val) use($chunk){
    return $chunk[$val];
}, $sort);

This is the output:

Array
(
    [2] => Array
        (
            [id] => 781
            [order] => 3
            [title] => 
        )

    [0] => Array
        (
            [id] => 212
            [order] => 1
            [title] => fdfdfdfdf
        )

    [1] => Array
        (
            [id] => 5
            [order] => 2
            [title] => 
        )

)

Now, if you want the keys to be 0,1,2..., you can use array_values, after mapping:

$arr = array_values($arr);

And the output:

Array
(
    [0] => Array
        (
            [id] => 781
            [order] => 3
            [title] => 
        )

    [1] => Array
        (
            [id] => 212
            [order] => 1
            [title] => fdfdfdfdf
        )

    [2] => Array
        (
            [id] => 5
            [order] => 2
            [title] => 
        )

)

Answer 2

Of course, there is no function for this. You'll have to do something similar

<?php
$chunk  = [
    // data
];
$sorted = [];
$sort   = [
    // ordered keys
];

foreach($sort as $keyToFind) {
    foreach($chunk as $arrayElement) {
        if($arrayElement['id'] == $keyToFind)) {
            $sorted[$keyToFind] = $arrayElement;
        }
    }
}

As you can see, this is a bit time and ressources consumming because of the two imbricated foreaches. Let's hope your arrays are not so big