How to flatten a multi-dimensional collection in illuminate/collections?

To flatten a multi-dimensional collection in Illuminate/Collections, you can use the flatten() method provided by the collection object.

Here is an example of how to use the flatten() method:

use Illuminate\Support\Collection;

// Create a multi-dimensional collection
$collection = collect([
    ['name' => 'John', 'age' => 25],
    ['name' => 'Jane', 'age' => 30],
    ['name' => 'Bob', 'age' => 35],
]);

// Flatten the collection
$flattenedCollection = $collection->flatten();

// Output the flattened collection
$flattenedCollection->each(function ($item) {
    echo $item . "\n";
});

In this example, the flatten() method is called on the $collection object. This method will flatten the multi-dimensional array into a single-dimensional array. The resulting flattened collection is stored in the $flattenedCollection variable.

To get the values from the flattened collection, you can use the each() method or any other collection method like foreach, map, etc.

Note: The flatten() method only flattens one level of nested arrays by default. If you have deeper nested arrays, you can pass a depth argument to specify how many nested levels you want to flatten. For example: $collection->flatten(2) will flatten two levels of nested arrays.