如何按字符串长度和字母顺序对Laravel集合进行排序？

Question

I'm using a Laravel Collection and this is what I currently have. I can sort by imageName or string length but I can't figure out how to do both at the same time. Some help would be appreciated!

function sortCards($collection) {
    return $collection->sortBy(function($key) {
        return strlen($key->imageName);
    })
    ->values();
}

I've tried this too:

function sortCards($collection) {
    return $collection->sortBy(function($key) {
        return $key->imageName;
    })
    ->sortBy(function($key) {
        return strlen($key->imageName);
    })
    ->values();
}

When I do it this way it only sorts based on the last sorting method, so it is alphabetically unsorted.

For example if the image names are:

p1, p1a, p2, p2a, p3, p3a, p4, p4a

Expected results would be:

p1, p2, p3, p4, p1a, p2a, p3a, p4a

Answer 1

@The Shift Exchange is right, natsort does that. However it only takes an array as argument. And it can't be a multilevel array. array_multisort in combination with the SORT_NATURAL flag works much better.

First we need to get a list. An array with only the property you want to sort by. array_multisort will use this list to sort the full $items array.

function sortCards($collection){
    $items = $collection->all();
    $list = $collection->lists('imageName');

    array_multisort($list, SORT_ASC, SORT_NATURAL, $items);

    return new Collection(array_values($items));;
}

Edit

Since PHP's natural sort prioritizes the alphabetical order over the length and you need the opposite you have to do it yourself using sort() (under the hood uasort gets called)

function sortCards($collection){
    return $collection->sort(function($a, $b){
        $lengthA = strlen($a->imageName);
        $lengthB = strlen($b->imageName);
        $valueA = $a->imageName;
        $valueB = $b->imageName;

        if($lengthA == $lengthB){
            if($valueA == $valueB) return 0;
            return $valueA > $valueB ? 1 : -1;
        }
        return $lengthA > $lengthB ? 1 : -1;
    });
}

Answer 2

What you are after is referred to as a natural sort. PHP does provide this functionality , so you'll just need to incorporate it into your function.

I havent tried it - but something along these lines should work (or at least point you in the right direction):

function sortCards($collection) {
    return $collection->sortBy(function($collection) {
        return natsort($collection->imageName);
    })

edit: this might even work:

  function sortCards($collection) {
        return natsort($collection->imageName);
  }