What are Contracts in Laravel

In Laravel, Contracts are basically interfaces that define what a class should do, without specifying how it does it.

🔹 Simple Meaning

A Contract = Promise (Interface)
It tells:

“Any class implementing me must provide these methods.”

🔧 Why Laravel Uses Contracts

Laravel uses contracts to:

• Keep code clean and flexible
• Allow easy swapping of implementations
• Support Dependency Injection
• Improve testability

🧠 Example

Laravel provides a contract like:

Illuminate\Contracts\Cache\Repository

This contract defines methods like:

get($key);
put($key, $value, $minutes);

Now different cache systems (file, database, Redis) can implement this contract.

💡 Real Example in Code

use Illuminate\Contracts\Cache\Repository as Cache;

class UserController
{
    protected $cache;

    public function __construct(Cache $cache)
    {
        $this->cache = $cache;
    }

    public function index()
    {
        return $this->cache->get('users');
    }
}

👉 Here:

• You're using a contract, not a specific cache class.
• Laravel automatically injects the correct implementation.

🔁 Contract vs Facade

🎯 Common Laravel Contracts

• Illuminate\Contracts\Auth\Authenticatable
• Illuminate\Contracts\Queue\Queue
• Illuminate\Contracts\Mail\Mailer
• Illuminate\Contracts\Filesystem\Filesystem

🧩 In Short

Contracts in Laravel = Interfaces that define behavior, enabling flexible and maintainable code using Dependency Injection.