Array (     [bigimg] => Array         (             [0] => Array                 (                     [id] => 2                     [imgtitle] => abc                     [imgintro] => asdasd                     [filename] => sda.jpg                     [imgtype] => indeximg                     [created_at] => 2016-10-26 14:58:14                 )              [1] => Array                 (                     [id] => 1                     [imgtitle] => sadas                     [imgintro] => asdasd                     [filename] => 147asda.jpg                     [imgtype] => indeximg                     [created_at] => 2016-10-24 14:13:12                 )          )      [minimg] => Array         (         )  )

现在只想遍历数组bigimg