Laravel, in addition to using multiple third-party packages, is also possible to use parts as components. All components are under the “Illuminate” namespace.
If there’s a really interesting and useful class, it’s Collection, which allows us to work with data arrays in a simple and “programmatic” way.
To have this class in our project, we only need the illuminate/support package which we can install with:
composer require illuminate/support:5.2.x-devTo show some examples, we’ll use a small array with this data:
$array = [
[
'id' => 12,
'name' => 'El rinconcillo',
'category' => 'Bar',
'visits' => 102,
'stars' => 4.2,
'average_price' => 20,
'city' => 'Sevilla',
'region' => 'Andalucía',
],
[
'id' => 30,
'name' => 'El Choco',
'category' => 'Bar',
'visits' => 65,
'stars' => 4.9,
'average_price' => 12,
'city' => 'Pontecesures',
'region' => 'Galicia',
],
[
'id' => 89,
'name' => 'La Azotea',
'category' => 'Restaurant',
'visits' => 165,
'stars' => 4.7,
'average_price' => 30,
'city' => 'Sevilla',
'region' => 'Andalucía',
],
[
'id' => 22,
'name' => 'Casa Paco',
'category' => 'Restaurant',
'visits' => 15,
'stars' => 3.7,
'average_price' => null,
'city' => 'Sevilla',
'region' => 'Andalucía',
]
];With this, we’ll create our collection object like this:
$places = new Illuminate\Support\Collection( $array ) ;Now we’ll see some examples of what can be done
Get an array (key => value) with the elements:
$list = $places->pluck( 'name', 'id')->all() ;Result:
Array
(
[12] => El rinconcillo
[30] => El Choco
[89] => La Azotea
[22] => Casa Paco
)Get the restaurant with the highest rating
$best_restaurant = $places
->where('category', 'Restaurant')
->sortByDesc( 'stars')
->take( 1 )
->toArray( );
;Get the sum of visits by business type
$visits_by_category = $places
->groupBy( 'category')
->map( function( $value, $key ) {
return $value->reduce( function( $prev, $next){
return $prev + $next['visits'];
}, 0 );
})
->toArray();The average of prices, by region, if the price is null we won’t take it into consideration:
$average_prices_by_region = $places->groupBy('region')
->map(function ($value, $key) {
return $value->reject(function ($value, $key) {
return is_null($value['average_price']);
})
->reduce(function ($prev, $next) {
if ( empty( $prev)) {
$prev = $next['average_price'];
}
return ( $prev + $next['average_price'] ) / 2 ;
} );
})->toArray();These are just a few examples that show a small part of the possibilities of this powerful class, and like everything in Laravel, it has complete documentation at: https://laravel.com/docs/5.2/collections
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