php array combine

[Stephen]

I have the next array:\[code\]Array( [0] => Array ( [id] => 160 [payment_period] => Monthly [plan_payment_type_id] => 171 [payment_type_id] => 4 ) [1] => Array ( [id] => 160 [payment_period] => Monthly [plan_payment_type_id] => 172 [payment_type_id] => 5 ) [2] => Array ( [id] => 161 [payment_period] => Weekly [plan_payment_type_id] => 173 [payment_type_id] => 9 ))\[/code\]I need to group this array by id. How can I do it in the best way?My output should be:\[code\]Array( [0] => Array ( [id] => 160 [payment_period] => Monthly [payment_types] => Array( [0] => Array( [plan_payment_type_id] => 171 [payment_type_id] => 4 ) [1] => Array( [plan_payment_type_id] => 172 [payment_type_id] => 5 ) ) ) [1] => Array ( [id] => 161 [payment_period] => Weekly [payment_types] => Array( [0] => Array( [plan_payment_type_id] => 173 [payment_type_id] => 9 ) ) ))\[/code\]Thank you very much.