이전 유효성 검사( 차원 ) - Laravel

In Laravel 5.3, we have a new validation option: image dimensions for image uploads
The validation rule is called dimensions, and you can pass the following parameters to it 

min_width: Images narrower than this pixel width will be rejected
max_width: Images wider than this pixel width will be rejected
min_height: Images shorter than this pixel height will be rejected
max_height: Images taller than this pixel height will be rejected
width: Images not exactly this pixel width will be rejected
height: Images not exactly this pixel height will be rejected
ratio: Images not exactly this ratio (width/height, expressed as "width/height") will be rejected

 public function postImage(Request $request)
 {
        $this->validate($request, [
             'avatar' => 'dimensions:min_width=250,min_height=500'
        ]);

        // or... 

        $this->validate($request, [
             'avatar' => 'dimensions:min_width=500,max_width=1500'
        ]);

        // or...

        $this->validate($request, [
             'avatar' => 'dimensions:width=100,height=100'
        ]);

        // or...

        // Ensures that the width of the image is 1.5x the height
        $this->validate($request, [
             'avatar' => 'dimensions:ratio=3/2'
        ]);
}

use Illuminate\Support\Facades\Validator;
use Illuminate\Validation\Rule;

Validator::make($data, [
    'avatar' => [
        'required',
        Rule::dimensions()->maxWidth(1000)->maxHeight(500)->ratio(3 / 2),
    ],
]);