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// From PHP 7.4, you can use the spread syntax to merge arrays in PHP like JavaScript
$firstArray = ['a' => 'life', 'b' => 'ball'];
$secondArray = ['c' => 'History'];
$thirdArray = [$firstArray, $secondArray];
// you can still use the array_merge function
$thirdArray = array_merge($firstArray, $secondArray);
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Arr::add()
The Arr::add method adds a given key / value pair to an array if the given key doesn't already exist in the array or is set to null:
use Illuminate\Support\Arr;
$array = Arr::add(['name' => 'Desk'], 'price', 100);
// ['name' => 'Desk', 'price' => 100]
$array = Arr::add(['name' => 'Desk', 'price' => null], 'price', 100);
// ['name' => 'Desk', 'price' => 100]