Online PHP editor | output for V9Dk9

<?php $arr = array( array('date' => '09-04-2018','item' => 'player 1', 'score' => '1'), array('date' => '09-04-2018','item' => 'player 2', 'score' => '2'), array('date' => '10-04-2018','item' => 'player 1', 'score' => '1'), array('date' => '10-04-2018','item' => 'player 2', 'score' => '2'), array('date' => '16-04-2018','item' => 'player 1', 'score' => '3'), array('date' => '16-04-2018','item' => 'player 2', 'score' => '4'), array('date' => '17-04-2018','item' => 'player 1', 'score' => '3'), array('date' => '17-04-2018','item' => 'player 2', 'score' => '4') ); //Week example Foreach($arr as $val){ $res[$val['item']][date("W", strtotime($val['date']))][] = $val['score']; } Var_dump($res);