获取二维数组中的数组数

我目前正在使用wordpress redux array的这个功能，它让我的用户做的是创建一个数组，填充可定制数量的嵌套数组(每个嵌套数组代表一张幻灯片)

我不擅长php，这是一个非常简单的问题，但是，如果我在foreach($mybigarray as $value)中运行它们，$value是否会成为每个子数组，所以我可以通过这个方法打印所有子数组的值:

foreach($mybigarray as $value){
  echo $value['1'];
  echo $value['2'];
}

如果这是假的，我将如何通过 If 语句运行每个子数组(数量未知)。有什么"最佳实践"是我应该知道的吗?

谢谢!

示例数组的输出:

Array ( 
  [0] => Array (
    [title] => Title #1
    [description] => Sub Title Text #1
    [url] => Link #1
    [sort] => 1
    [attachment_id] => 1461
    [image] => http://demo.pixelcrescent.com/LeagueOfLegends/wp-content/uploads/2014/06/mountains.jpg
    [height] => 1200
    [width] => 1920
    [thumb] => http://demo.pixelcrescent.com/LeagueOfLegends/wp-content/uploads/2014/06/mountains-150x150.jpg
  )[1] => Array (
    [title] => Title #2
    [description] => Sub Title Text #2
    [url] => Link #2
    [sort] => 2
    [attachment_id] => 1461
    [image] => http://demo.pixelcrescent.com/LeagueOfLegends/wp-content/uploads/2014/06/mountains.jpg
    [height] => 1200
    [width] => 1920
    [thumb] => http://demo.pixelcrescent.com/LeagueOfLegends/wp-content/uploads/2014/06/mountains-150x150.jpg
  )[2] => Array (
    [title] => Title #3
    [description] => Sub Title Text #3
    [url] => link #3
    [sort] => 3
    [attachment_id] => 1461
    [image] => http://demo.pixelcrescent.com/LeagueOfLegends/wp-content/uploads/2014/06/mountains.jpg
    [height] => 1200
    [width] => 1920
    [thumb] => http://demo.pixelcrescent.com/LeagueOfLegends/wp-content/uploads/2014/06/mountains-150x150.jpg
  )
)