How can I sort object on laravel?

Question

My object array ($c) like this :

Array
(
    [0] => stdClass Object
        (
            [id] => 3
            [name] => chelsea.png
        )

    [1] => stdClass Object
        (
            [id] => 4
            [name] => arsenal.png
        )

    [2] => stdClass Object
        (
            [id] => 5
            [name] => mu.png
        )

    [3] => stdClass Object
        (
            [id] => 1
            [name] => city.png
        )

)

I want to sort it by id

If in php normal I try like this :

function sort_by_id( $a, $b )
{ 
  if(  $a->id ==  $b->id ){ return 0 ; } 
  return ($a->id < $b->id) ? -1 : 1;
} 
usort($c,'sort_by_id');  
echo '<pre>';print_r($c);echo '</pre>';

It works

But How can I implement it use laravel?

I try like this :

public function add($param)
{
    ...
    usort($c, $this->sortById()); 
    echo '<pre>';print_r($c);echo '</pre>';die();
    ...
}

private function sortById($a, $b)
{ 
    if($a->id == $b->id) { 
        return 0 ; 
    } 
    return ($a->id < $b->id) ? -1 : 1;
} 

It does not work

There exist error like this :

Undefined property ... $sortById ...

How can I solve it?

Answer 1

Don't reinvent the wheel. Laravel is a fantastic framework that did lots of work for you already.

First, you need to convert your array to a Collection:

$c = collect($c);

Now, For working with collections, you have a nice set of available methods you can work with. In your case, you need the sortBy():

$sorted = $c->sortBy('id');

Alternatively, you can pass a callback:

$sorted = $c->sortBy(function ($item, $key) {
    return $item->id;
});

Both of these will return a Collection object. If you want to get an Array back instead, use all() or toArray() on your result:

$c = $c->all();

// or

$c = $c->toArray();

Answer 2

Try this

public function add($param)
{
    ...
    usort($c, function($a, $b){
        if($a->id == $b->id) { 
        return 0 ; 
    } 
    return ($a->id < $b->id) ? -1 : 1;
    }); 
    echo '<pre>';print_r($c);echo '</pre>';die();
    ...
}

You don't need to use different sortById method