Singleton

Description: Registers the class as a singleton in the container — shared across the entire application lifecycle.

Namespace: Illuminate\Container\Attributes\Singleton

Added in: Laravel 12.21

Usage

use Illuminate\Container\Attributes\Singleton;

// Before (service provider):
$this->app->singleton(ConfigCache::class);

use Illuminate\Container\Attributes\Singleton;

// After:
#[Singleton]
class ConfigCache
{
    private array $cache = [];

    public function remember(string $key, callable $callback): mixed
    {
        return $this->cache[$key] ??= $callback();
    }
}

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