collect in laravel code example

Example 1: add to collection laravel

$item = collect();
$item->push($product);

Example 2: laravel collection methods

$collection = collect([1,2,3,4]);

$collection->each(function($item){
    return $item*$item;
});

// [1,4,9,16]

Example 3: collection methods laravel

$collection->each(function ($item, $key) {
    hj
});