Online PHP editor | refs for gNoTK

<?php $array = [ [ 'name' => 'Umber', 'reason' => 'No data', 'id' => '12' ], [ 'name' => 'Jakar', 'reason' => 'Wrong format', 'id' => '12' ], [ 'name' => 'Lane', 'reason' => 'No data', 'id' => '12' ], [ 'name' => 'Jake', 'reason' => 'Not found', 'id' => '13' ], [ 'name' => 'Jame', 'reason' => 'Wrong name', 'id' => '13' ], [ 'name' => 'Joe', 'reason' => 'No data', 'id' => '13' ] ]; $result = []; foreach ($array as $row) { $result[$row['id']][] = $row['reason']; } var_export($result); echo "\n---\n"; var_export( array_reduce( $array, function($result, $row) { $result[$row['id']][] = $row['reason']; return $result; }, [] ) );