MegaHit MegaHit - 9 months ago 40
PHP Question

PHP - Sort multi-dimensional array by another array

I'm trying to sort a multi-dimensional array by another array, but have so far come up short.

seems be working only for real sorting.

Suppose I have these 2 arrays:

$order = array(2,3,1);

$data = array(
array('id' => 1, 'title' => 'whatever'),
array('id' => 2, 'title' => 'whatever'),
array('id' => 3, 'title' => 'whatever')
);


Now I would like to sort my
$data
array according to the order in my
$order
array.

This is what I would like the result to be:

$data = array(
array('id' => 2, 'title' => 'whatever'),
array('id' => 3, 'title' => 'whatever')
array('id' => 1, 'title' => 'whatever'),
);





I can accomplish this easily by running a nested loop, but that would not scale well (my array is pretty big, and the arrays have many more fields).

Answer Source

There is no built-in function for this in PHP and i am unable to think of any custom function, which would do this using usort. But array_map is simple enough, imo, so why not use it instead?

$sorted = array_map(function($v) use ($data) {
    return $data[$v - 1];
}, $order);