PHP Composer and PSR-4

Autoload classes and manage open-source dependencies via Composer.

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Composer is the dependency manager for PHP. It implements the PSR-4 autoloading standard, which maps PHP namespaces directly to file system directories.

Key Takeaways: PHP Composer and PSR-4

Mastering PHP Composer and PSR-4 helps you write clean and reliable PHP code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

PHP Composer and PSR-4 Code Example

PHP

// In composer.json:
// "autoload": { "psr-4": { "App\\": "app/" } }

echo "PSR-4 autoloading maps namespace App\Services to folder app/Services/";

Output

PSR-4 autoloading maps namespace App\Services to folder app/Services/

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

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PHP Composer and PSR-4

💡 Key Takeaways: PHP Composer and PSR-4

PHP Composer and PSR-4 Code Example

Key Takeaways: PHP Composer and PSR-4