如何在PHP中迭代Dropbox结果数组

如何在php中迭代数组对象.我需要保存来自Dropbox的下面数组的路径.请有人帮我这个.下面是我打印“var_dump($data)”时的结果,这是由Dropbox在尝试获取特定文件夹的文件时给出的.
对象看起来像：

array (size=14)
  'read_only' => boolean false
  'hash' => string '6bb3719bc8b46aaa392d5787df8e71d7' (length=32)
  'revision' => int 11
  'bytes' => int 0
  'thumb_exists' => boolean false
  'rev' => string 'b403db773' (length=9)
  'modified' => string 'Thu,26 Nov 2015 20:54:51 +0000' (length=31)
  'size' => string '0 bytes' (length=7)
  'path' => string '/1' (length=2)
  'is_dir' => boolean true
  'modifier' => null
  'root' => string 'dropbox' (length=7)
  'contents' => 
    array (size=28)
      0 => 
        array (size=14)
          'rev' => string '13403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (1).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 07:56:44 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 07:56:44 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 19
      1 => 
        array (size=14)
          'rev' => string '14403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (2).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:00:18 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:00:18 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 20
      2 => 
        array (size=14)
          'rev' => string '15403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (3).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:01:08 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:01:08 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 21
      3 => 
        array (size=14)
          'rev' => string '16403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (4).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:24:20 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:24:20 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 22
      4 => 
        array (size=14)
          'rev' => string '17403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (5).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:25:31 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:25:31 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 23
      5 => 
        array (size=14)
          'rev' => string '19403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (6).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:30:47 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:30:47 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 25
      6 => 
        array (size=14)
          'rev' => string '1a403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (7).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:31:34 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:31:34 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 26
      7 => 
        array (size=14)
          'rev' => string '1b403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (8).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:33:09 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:33:09 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 27
      8 => 
        array (size=14)
          'rev' => string '1c403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (9).jpg' (length=28)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:33:35 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:33:35 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 28
      9 => 
        array (size=14)
          'rev' => string '1d403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (10).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:34:40 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:34:40 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 29
      10 => 
        array (size=14)
          'rev' => string '1e403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (11).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:35:09 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:35:09 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 30
      11 => 
        array (size=14)
          'rev' => string '1f403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (12).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:36:01 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:36:00 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 31
      12 => 
        array (size=14)
          'rev' => string '20403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (13).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:38:11 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:38:09 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 32
      13 => 
        array (size=14)
          'rev' => string '21403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (14).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:39:14 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:39:13 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 33
      14 => 
        array (size=14)
          'rev' => string '22403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (15).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:40:14 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:40:14 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 34
      15 => 
        array (size=14)
          'rev' => string '23403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (16).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:40:31 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:40:30 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 35
      16 => 
        array (size=14)
          'rev' => string '24403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (17).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:44:02 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:44:02 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 36
      17 => 
        array (size=14)
          'rev' => string '25403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (18).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:46:37 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:46:37 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 37
      18 => 
        array (size=14)
          'rev' => string '26403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (19).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:47:16 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:47:15 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 38
      19 => 
        array (size=14)
          'rev' => string '27403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (20).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:48:08 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:48:08 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 39
      20 => 
        array (size=14)
          'rev' => string '28403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (21).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:53:21 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:53:21 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 40
      21 => 
        array (size=14)
          'rev' => string '29403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (22).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:54:11 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:54:11 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 41
      22 => 
        array (size=14)
          'rev' => string '2a403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640 (23).jpg' (length=29)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:54:41 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 08:54:41 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 42
      23 => 
        array (size=14)
          'rev' => string '12403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/flower-171644_640.jpg' (length=24)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 05:21:13 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 50552
          'modified' => string 'Fri,27 Nov 2015 05:21:12 +0000' (length=31)
          'size' => string '49.4 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 18
      24 => 
        array (size=14)
          'rev' => string '11403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/frog-927764_640 (1).jpg' (length=26)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 05:14:07 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 54351
          'modified' => string 'Fri,27 Nov 2015 05:14:07 +0000' (length=31)
          'size' => string '53.1 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 17
      25 => 
        array (size=14)
          'rev' => string '18403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/frog-927764_640 (2).jpg' (length=26)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 08:27:21 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 54351
          'modified' => string 'Fri,27 Nov 2015 08:27:21 +0000' (length=31)
          'size' => string '53.1 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 24
      26 => 
        array (size=14)
          'rev' => string '10403db773' (length=10)
          'thumb_exists' => boolean true
          'path' => string '/1/frog-927764_640.jpg' (length=22)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 04:52:42 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 54351
          'modified' => string 'Fri,27 Nov 2015 04:52:42 +0000' (length=31)
          'size' => string '53.1 KB' (length=7)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 16
      27 => 
        array (size=14)
          'rev' => string 'd403db773' (length=9)
          'thumb_exists' => boolean true
          'path' => string '/1/lotos.jpg' (length=12)
          'is_dir' => boolean false
          'client_mtime' => string 'Fri,27 Nov 2015 03:09:12 +0000' (length=31)
          'icon' => string 'page_white_picture' (length=18)
          'read_only' => boolean false
          'modifier' => null
          'bytes' => int 63500
          'modified' => string 'Fri,27 Nov 2015 03:09:12 +0000' (length=31)
          'size' => string '62 KB' (length=5)
          'root' => string 'dropbox' (length=7)
          'mime_type' => string 'image/jpeg' (length=10)
          'revision' => int 13
  'icon' => string 'folder' (length=6)

$paths = array();

// $dropbox_array is the multidimensional array you're getting from dropbox

foreach($dropbox_array['contents'] as $file_desp_array){
    $paths[] = $file_desp_array['path'];
}

var_dump($paths);