1. 通过 composer 安装 composer intervention/image

2. 修改 config/app.php 文件，添加 $providers 和 $aliases

   'Intervention\Image\ImageServiceProvider'

'Image' => 'Intervention\Image\Facades\Image'

1. By default Intervention Image uses PHP's GD library extension to process all images. If you want to switch to Imagick, you can pull a configuration file into your application by running on of the following artisan command.

Publish configuration in Laravel 5

$ php artisan vendor:publish --provider="Intervention\Image\ImageServiceProviderLaravel5"

Handling image uploads in Laravel

In a Laravel application it is also possible to pass an uploaded file directly to the make method.

Creating Image from File Upload in Laravel

// resizing an uploaded fileImage::make(Input::file('photo'))->resize(300, 200)->save('foo.jpg');

参考资料

ORM-based file upload package for php.