How does Composer handle dependencies and autoload in PHP projects?

Composer handles dependencies in PHP projects by allowing developers to define required libraries in a `composer.json` file and then automatically downloading and managing these dependencies. Composer also takes care of autoloading classes, making it easier to organize and include external libraries in your project. 

// Example composer.json file
{
    "require": {
        "monolog/monolog": "^1.0"
    }
}
```

To autoload classes using Composer, you can use the `vendor/autoload.php` file generated by Composer. This file includes an autoloader that automatically loads classes based on their namespace. 

```php
// Autoload classes using Composer
require 'vendor/autoload.php';

use Monolog\Logger;
use Monolog\Handler\StreamHandler;

// Create a logger
$log = new Logger('name');
$log->pushHandler(new StreamHandler('path/to/your.log', Logger::WARNING));

// Add records to the log
$log->warning('Foo');
$log->error('Bar');

Keywords

Composer dependencies autoload PHP projects libraries

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