Laravel 5 Collections: Swapping Element Keys and Values With flip

The flip method will return a new Collection instance where are the all the collection item's keys have been exchanged with their corresponding values.

The behavior of the flip method is similar to PHP's array_flip function.

#Signature

1public function flip();

#Example Use

The following code example demonstrates the effects of the flip method:

 1use Illuminate\Support\Collection;
 2 
 3// Create a new collection instance.
 4$collection = new Collection([
 5    'first'  => 'I am first',
 6    'second' => 'I am second',
 7    'third'  => 'I am third'
 8]);
 9 
10// Flip the original collection.
11$flippedCollection = $collection->flip();

The $flippedCollection variable will now contain a new instance of the Collection class with a structure similar to the following output:

1object(Illuminate\Support\Collection)
2  protected 'items' =>
3    array
4      'I am first'  => string 'first'
5      'I am second' => string 'second'
6      'I am third'  => string 'third'

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