Sort an array (looking a specific value) based on another array

Question

I have this array of options, and some value of an internal array is the "ID"

[options] => Array (
    [0] => Array (
        [id] => 1088
        [label] => John
    )
    [1] => Array (
        [id] => 1089
        [label] => Peter
    )
    [2] => Array (
        [id] => 1050
        [label] => Mary
    )
    ....

On the other hand, I have this array:

$array_sort = array(1089, 1050, 1088, ...);

I would like the options array of the first array is sorted (looking the "id") based on the $array_sort.

I know how to do it in a very dirty way (with a lot of loops and temporary arrays), but I guess there's some smart solution of array_* functions to do this.

Thank you !

Thank you for the edition, @Qirel

FlamingMoe
– FlamingMoe

2017-02-10 19:11:58 +00:00
Commented Feb 10, 2017 at 19:11 — FlamingMoe
– FlamingMoe, Commented Feb 10, 2017 at 19:11

Steven Jeffries · Accepted Answer · 2017-02-11 13:02:09Z

1

You could use array_filter to limit the options to only those in the sorted array, then usort to sort them based on their position in the $array_sort array using array_search:

$sorted = array_filter($options, function($arr) use($array_sort) {
    return in_array($arr['id'], $array_sort);
});
usort($sorted, function($a, $b) use($array_sort) {
    return array_search($a['id'], $array_sort) - array_search($b['id'], $array_sort);
});
// $sorted should now be the sorted array

edited Feb 11, 2017 at 13:02

answered Feb 10, 2017 at 19:45

Steven Jeffries

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4 Comments

FlamingMoe Over a year ago

$sorted returns just 1 :-(

Steven Jeffries Over a year ago

Sorry, it sorts the array in-place. I'll edit the code.

FlamingMoe Over a year ago

I can't edit, but you missed the "use ($array_sort)" in the two functions in order to get the array_sort right scope, since it's outside the functions ;-) and IT WORKS !! THANK YOU

Steven Jeffries Over a year ago

Thanks for pointing that out. I added it. I guess that's what happens when you try to write code in the answer box.

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