Comment puis-je filtrer et retirer un array dans un autre array

Bonjour,

J'ai une variable de type array qui contient beaucoup de donnée dont je ne veut afficher.

Voici un extrait.
Vous voyer que pour chaque (int)x il y a un alias pour Aco.
J'aimerais filter pour garder que les alias qui sot 'controllers', 'admin_index','admin_edit' etc.

Code:

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array(
	(int) 0 => array(
		'Aco' => array(
			'id' => '1',
			'parent_id' => null,
			'model' => null,
			'foreign_key' => null,
			'alias' => 'controllers',
			'lft' => '1',
			'rght' => '184'
		),
		'Aro' => array(
			(int) 0 => array(
				'id' => '2',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '1',
				'alias' => null,
				'lft' => '1',
				'rght' => '4',
				'Permission' => array(
					'id' => '1',
					'aro_id' => '2',
					'aco_id' => '1',
					'_create' => '1',
					'_read' => '1',
					'_update' => '1',
					'_delete' => '1'
				)
			),
			(int) 1 => array(
				'id' => '5',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '2',
				'alias' => null,
				'lft' => '5',
				'rght' => '8',
				'Permission' => array(
					'id' => '2',
					'aro_id' => '5',
					'aco_id' => '1',
					'_create' => '-1',
					'_read' => '-1',
					'_update' => '-1',
					'_delete' => '-1'
				)
			),
			(int) 2 => array(
				'id' => '6',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '3',
				'alias' => null,
				'lft' => '9',
				'rght' => '12',
				'Permission' => array(
					'id' => '5',
					'aro_id' => '6',
					'aco_id' => '1',
					'_create' => '-1',
					'_read' => '-1',
					'_update' => '-1',
					'_delete' => '-1'
				)
			),
			(int) 3 => array(
				'id' => '7',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '4',
				'alias' => null,
				'lft' => '13',
				'rght' => '14',
				'Permission' => array(
					'id' => '10',
					'aro_id' => '7',
					'aco_id' => '1',
					'_create' => '-1',
					'_read' => '-1',
					'_update' => '-1',
					'_delete' => '-1'
				)
			),
			(int) 4 => array(
				'id' => '10',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '5',
				'alias' => null,
				'lft' => '15',
				'rght' => '16',
				'Permission' => array(
					'id' => '13',
					'aro_id' => '10',
					'aco_id' => '1',
					'_create' => '-1',
					'_read' => '-1',
					'_update' => '-1',
					'_delete' => '-1'
				)
			),
			(int) 5 => array(
				'id' => '11',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '6',
				'alias' => null,
				'lft' => '17',
				'rght' => '18',
				'Permission' => array(
					'id' => '20',
					'aro_id' => '11',
					'aco_id' => '1',
					'_create' => '0',
					'_read' => '0',
					'_update' => '0',
					'_delete' => '0'
				)
			),
			(int) 6 => array(
				'id' => '15',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '7',
				'alias' => null,
				'lft' => '19',
				'rght' => '20',
				'Permission' => array(
					'id' => '21',
					'aro_id' => '15',
					'aco_id' => '1',
					'_create' => '0',
					'_read' => '0',
					'_update' => '0',
					'_delete' => '0'
				)
			)
		),
		'Action' => 'controllers'
	),
	(int) 1 => array(
		'Aco' => array(
			'id' => '6',
			'parent_id' => '1',
			'model' => null,
			'foreign_key' => null,
			'alias' => 'Categories',
			'lft' => '2',
			'rght' => '13'
		),
		'Aro' => array(
			(int) 0 => array(
				'id' => '2',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '1',
				'alias' => null,
				'lft' => '1',
				'rght' => '4',

Par exemple, si je décide de ne pas avoir 'Categorie', il faudrait que ceci (y compris les Aro, soit retiré

Code:

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(int) 1 => array(
		'Aco' => array(
			'id' => '6',
			'parent_id' => '1',
			'model' => null,
			'foreign_key' => null,
			'alias' => 'Categories',
			'lft' => '2',
			'rght' => '13'
		),
		'Aro' => array(
			(int) 0 => array(
				'id' => '2',
				'parent_id' => null,
				'model' => 'Group',
				'foreign_key' => '1',
				'alias' => null,
				'lft' => '1',
				'rght' => '4',
[... suite du tableau ...]

Comment puis-je faire ceci?

Milles mercis