Online PHP editor | refs for YkMYR

<?php $data = [ [ 'record_id' => 3, 'task_date' => '2018-10-02' ], [ 'record_id' => 5, 'task_date' => '2018-10-02' ], [ 'record_id' => 1, 'task_date' => '2018-09-27' ] ]; $out = []; $datesIterated = []; foreach ($data as $date) { if(in_array($date['task_date'], $datesIterated)) { continue; } $out[] = array_filter($data, function($item) use ($date) { if ($item['task_date'] == $date['task_date']) { return $item; } }); $datesIterated[] = $date['task_date']; } var_dump($out);