MimeTypes::get_mimetype PHP Method

    public static function get_mimetype($ext)
    {
        return isset(self::$mime_types[$ext]) ? self::$mime_types[$ext] : 'application/octet-stream';
    }

 public function uploadOSS($input_file_field = 'pic', $save_dir = 'pic', $ext = 'jpg')
 {
     $file_path = $_FILES[$input_file_field]["tmp_name"];
     if (!$file_path) {
         FLogger::write('tmp_name为空', 'update_mumu');
         return '';
     }
     $file_md5 = md5_file($file_path);
     $_file_path_info = pathinfo($_FILES[$input_file_field]['name']);
     $file_ext = strtolower($_file_path_info['extension']);
     if (!$file_ext) {
         $this->get_extension($file_path);
     }
     if (!$file_ext) {
         $file_ext = $ext;
     }
     $content_type = MimeTypes::get_mimetype(strtolower($file_ext));
     $object = 'oss/' . $save_dir . '/' . date('Ym/d/His') . rand(10000, 99999) . '.' . $file_ext;
     $flag = $this->oss->upload_by_file($this->bucket, 'uploads/' . $object, $file_path, $content_type);
     if (!$flag) {
         $object = '';
     }
     $data = array('object' => $object, 'md5' => $file_md5);
     return $data;
 }