Image::make(Input::file('photo'))->resize(300, 200)->save('foo.jpg');

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/5/2 0002
 * Time: 17:34
 */
namespace App\Libs;
class UploadUtils {
  /**
   * 隨機的文件名
   * @param int $len 隨機文件名的長度
   * @return str 隨機字符串
   */
  private static function randName($len = 10) {
    return substr(str_shuffle('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234565789'), 0, $len);
  }
  /**
   * 創(chuàng)建文件上傳到的路徑
   * @return str 文件上傳的路徑
   */
  private static function createDir() {
    $dir = env('UPLOADPATH') . date('Ymd', time());
    if (is_dir($dir) || mkdir($dir, 0777, true)) {
      return $dir;
    }
  }
  /**
   * 獲取上傳文件的路徑
   * @return str 文件的全路徑
   */
  public static function getUploadPath($ext = 'jpg') {
    return self::createDir() . '/' . self::randName() . '.' . $ext;
  }
}

//上傳縮略圖
if ($request->hasFile('thumb')) {//存在圖片
   $file = $request->file('thumb');
   $path = UploadUtils::getUploadPath($file->guessExtension());//獲取保存的文件路徑
   Image::make($file)->resize(env('THUMB_WIDTH'), env('THUMB_HEIGHT'))->save($path);//保存
   ...
   #save database
   ...
}