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<?php $input = array ( "group_name_1" => "audi", "group_locations_1" => "tokyo,barcelona,paris", "group_quantities_at_locations_1" => "1,2,7", "group_name_2" => "ford", "group_locations_2" => "london,prag", "group_quantities_at_locations_2" => "3,6" ); print_r(array_chunk($input,3));
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => Array ( [0] => audi [1] => tokyo,barcelona,paris [2] => 1,2,7 ) [1] => Array ( [0] => ford [1] => london,prag [2] => 3,6 ) )

preferences:
254.24 ms | 404 KiB | 294 Q