how to create autoload.php using composer code example

Example 1: composer autoload dump

composer dump-autoload

Example 2: composer autoload

require __DIR__ . '/vendor/autoload.php';

$log = new Monolog\Logger('name');
$log->pushHandler(new Monolog\Handler\StreamHandler('app.log', Monolog\Logger::WARNING));
$log->addWarning('Foo');