Online PHP editor | output for U7nvD

<?php $dataItems = [ [ 'id' => 1, 'serial' => "XXXXXXAA1", 'pd_item_info' => [ 'id' => 1, 'quantity' => 5, 'ipo_item_pml_info' => [ 'id' => 1, 'product_name' => 'Keyboard' ] ] ], [ 'id' => 33, 'serial' => "XXXXXXFOO", 'pd_item_info' => [ 'id' => 33, 'quantity' => 100, 'ipo_item_pml_info' => [ 'id' => 33, 'product_name' => 'Speaker' ] ] ], [ 'id' => 2, 'serial' => "XXXXXXAA2", 'pd_item_info' => [ 'id' => 2, 'quantity' => 10, 'ipo_item_pml_info' => [ 'id' => 2, 'product_name' => 'Keyboard' ] ] ] ]; $result = []; foreach ( $dataItems as [ 'pd_item_info' => ['ipo_item_pml_info' => ['product_name' => $name]], 'serial' => $result[$name][] ] ); var_export($result);