Laravel 8 has() {#collection-method}

has 方法判断集合中是否存在指定键：

$collection = collect(['account_id' => 1, 'product' => 'Desk', 'amount' => 5]);

$collection->has('product');

// true

$collection->has(['product', 'amount']);

// true

$collection->has(['amount', 'price']);

// falseCopy