我有一个看起来像这样的数组：
Array
(
[0] => Array
(
[Project] => Array
(
[id] => 3
[title] => Title001
[created] => 0000-00-00 00:00:00
[modified] => 2013-08-05 17:39:07
)
[Keyword] => Array
(
[0] => Array
(
[id] => 1
[project_id] => 3
[title] => Num1
[demand] => 50000000000
[competition] => 37889.56700
[cpc] => 676.50
[created] => 2013-06-26 17:54:48
[modified] => 2013-09-19 13:37:25
)
[1] => Array
(
[id] => 13
[project_id] => 3
[title] => test
[demand] => 314
[competition] => 2341.00000
[cpc] => 9999.99
[created] => 2013-09-16 11:05:12
[modified] => 2013-09-16 11:05:12
)
)
)
[1] => Array
(
[Project] => Array
(
[id] => 4
[title] => Erdmann
[created] => 0000-00-00 00:00:00
[modified] =>
)
[Keyword] => Array
(
[0] => Array
(
[id] => 3
[project_id] => 4
[title] => Num5
[demand] => 76534000000
[competition] => 5555.55560
[cpc] => 99.34
[created] => 2013-06-26 17:54:48
[modified] => 2013-09-19 13:37:36
)
[1] => Array
(
[id] => 4
[project_id] => 4
[title] => Num anything
[demand] => 84000
[competition] => 8765.62340
[cpc] => 543.83
[created] => 2013-06-26 17:54:48
[modified] => 2013-09-11 12:08:50
)
)
)
[2] => Array
(
[Project] => Array
(
[id] => 5
[title] => Value
[created] => 2013-09-11 11:18:22
[modified] => 2013-09-11 11:18:22
)
[Keyword] => Array
(
[0] => Array
(
[id] => 2
[project_id] => 5
[title] => foo
[demand] => 4500000000
[competition] => 876.78500
[cpc] => 66.67
[created] => 2013-06-26 17:54:48
[modified] => 2013-09-19 13:37:32
)
[1] => Array
(
[id] => 5
[project_id] => 5
[title] => bar
[demand] => 5000568
[competition] => 667.56543
[cpc] => 667.60
[created] => 2013-06-26 17:54:48
[modified] => 2013-09-11 12:08:09
)
)
)
[3] => Array
(
[Project] => Array
(
[id] => 6
[title] => wolrd.net
[created] => 2013-09-16 11:23:42
[modified] => 2013-09-16 11:23:42
)
[Keyword] => Array
(
[0] => Array
(
[id] => 15
[project_id] => 6
[title] => Earth
[demand] => 5363
[competition] => 93479.34000
[cpc] => 5599.99
[created] => 2013-09-16 11:25:15
[modified] => 2013-09-16 11:26:15
)
)
)
)
使用所有关键字访问 Title001 的正确方法是什么？