Dataset Example Row:

0_id			: 25
0_firstname		: Slyvester
0_lastname		: Oosterbos
1_id			: 91
1_email			: sly@whatever.com
2_id			: 266
2_telephone		: 09987 787424
3_id			: 33
3_studentid		: 77942421
3_schemeofstudy		: 71
4_id			: 101
4_projtitle		: Writing a Recursive Function!


Desired result:

array(
  [0] => array (
    [0] => array(
	[0] => array(
           'id' => 25,
           'firstname' => Slyvester,
           'lastname' => Oosterbos,
           'childtables' => array(
	         [1] => array(
		     [0] => array(
			   'id' => 91,
			   'email' => sly@whatever.com
			   ),
		     [1] => array(
			   'id' => 92,
			   'email' => sly@supbitch.com
		      ),
		 [2] => array (
		     [0] => array(
			   'id' => 266,
			   'telephone' => 09987 787424
			   ),
		      ),
	         [3] => array(
		     [0] => array(
			   'id' => 33,
		           'studentid' => 77942421,
			   'schemeofstudy' => 71,
			   'childtables' => array(
				[4] => array (
				     [0] => array(
   					  'id' => 101,
					  'projtitle' => Writing a Recursive Function!
					)
				)
			)
		)
	    )
        )
     )
  )



Array Key Tree

array (
	[0] => array (
		[1] => true,
		[2] => true,
		[3] => array (
			[4] => true
		)
	)
)