How to Image Resize in Laravel 5?

How to resize in image upload. This is my code

$excel_file_name = $request->input('attribute_image');

$fileExtension = strtolower($request->file('attribute_image')
    ->getClientOriginalExtension());

$file_name = sha1(uniqid().$excel_file_name.uniqid()).'.'.$fileExtension;

$request->file('attribute_image')
    ->move($this->attribute_category_base_img_path, $file_name);