A Simple Collection Trick: Using flip() in Laravel

Laravel Collections provide many useful methods, and one of the most overlooked is:

flip()

It allows you to swap keys and values instantly.

Basic Example

$roles = collect([
    1 => 'Admin',
    2 => 'Manager',
    3 => 'Customer',
]);
$roles->flip();

Output:

collect([
    'Admin' => 1,
    'Manager' => 2,
    'Customer' => 3,
]);

Real Project Example

Imagine you receive role data:

$roles = [
    1 => 'Admin',
    2 => 'Editor',
    3 => 'Customer',
];

You need to quickly find the ID of a role:

$roleId = collect($roles)
    ->flip()
    ->get('Editor');

Result:

2

No loops.

No manual searching.

Another Practical Example

Convert country mappings:

$countries = collect([
    'IN' => 'India',
    'US' => 'United States',
]);

Need the country code?

$code = $countries
    ->flip()
    ->get('India');

Result:

IN

Important Note

Values must be unique.

Example:

collect([
    1 => 'Admin',
    2 => 'Admin',
])->flip();

Only the last matching key will remain.

When to Use flip()

Use it when:

• Creating lookup tables
• Converting labels to IDs
• Reversing configuration mappings
• Avoiding manual array searches