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// composer.json "autoload": { "psr-4": { "App\\": "src/" } } // src/Services/EmailService.php namespace App\Services; class EmailService { public function send(string $to): void {} } // Usage (after composer dump-autoload) require "vendor/autoload.php"; use App\Services\EmailService; $svc = new EmailService(); $svc->send("user@example.com");
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