How to use collect in Laravel 5.3?

Question

I need use collect in Laravel 5.3 but I need help.

For Example:

$collection = collect([
  'Apple' => [
      ['name' => 'iPhone 6S', 'price' => '200'],
      ['name' => 'iPhone 7S', 'price' => '250'],
  ],
  'Samsung' => [
      ['name' => 'Galaxy S7', 'price' => '300']
      ['name' => 'Galaxy note', 'price' => '150']
  ],
]);

1. How to get Apple or Samsung name with collect? I need get brand name.
2. How to get (name and price) the cheapest price of each brand.

Thank you :-)

Answer 1

You could achieve that through mapWithKeys

/* First get the minimum price */

$min = $collection->flatten(1)->pluck('price')->min();

/* Then perform the filteration */

$final = $collection->mapWithKeys(function($value, $key) use ($min) {
    $result = collect($value)->filter(function($inner) use ($min){
        return $inner['price'] === $min;
    })->keys()->first();

    return $result ? [$key => $value[$result]]: [];
});

When you run the above code, you will get

Illuminate\Support\Collection Object
(
    [items:protected] => Array
        (
            [Samsung] => Array
                (
                    [name] => Galaxy note
                    [price] => 150
                )

        )

)

Now to get brand name simply do

$final->keys()->first() // Samsung

To get model name

$final->pluck('name')->first() // Galaxy note