Online PHP editor | refs for pBOn6

<?php $program = [ '2021-07-11' => [ ['movie' => 'Movie 1', 'channel' => 'Channel 10', 'time' => '23:00'], ['movie' => 'Movie 2', 'channel' => 'Channel 2', 'time' => '01:15'], ['movie' => 'Movie 8', 'channel' => 'Channel 4', 'time' => '11:00'], ['movie' => 'Movie 12', 'channel' => 'Channel 11', 'time' => '17:30'], ['movie' => 'Movie 14', 'channel' => 'Channel 5', 'time' => '21:00'], ['movie' => 'Movie 15', 'channel' => 'Channel 5', 'time' => '02:20'], ['movie' => 'Movie 17', 'channel' => 'Channel 11', 'time' => '17:30'], ['movie' => 'Movie 19', 'channel' => 'Channel 5', 'time' => '10:00'], ['movie' => 'Movie 21', 'channel' => 'Channel 8', 'time' => '1:20'], ['movie' => 'Movie 33', 'channel' => 'Channel 5', 'time' => '00:20'], ['movie' => 'Movie 39', 'channel' => 'Channel 3', 'time' => '17:30'], ['movie' => 'Movie 40', 'channel' => 'Channel 3', 'time' => '22:00'], ['movie' => 'Movie 41', 'channel' => 'Channel 5', 'time' => '14:00'], ['movie' => 'Movie 42', 'channel' => 'Channel 5', 'time' => '23:00'], ['movie' => 'Movie 43', 'channel' => 'Channel 2', 'time' => '14:15'], ['movie' => 'Movie 44', 'channel' => 'Channel 2', 'time' => '18:00'], ['movie' => 'Movie 45', 'channel' => 'Channel 2', 'time' => '23:45'], ['movie' => 'Movie 46', 'channel' => 'Channel 1', 'time' => '22:00'], ['movie' => 'Movie 47', 'channel' => 'Channel 6', 'time' => '21:10'] ], '2021-07-10' => [ ['movie' => 'Movie 3', 'channel' => 'Channel 2', 'time' => '14:15'], ['movie' => 'Movie 5', 'channel' => 'Channel 3', 'time' => '22:00'], ['movie' => 'Movie 6', 'channel' => 'Channel 11', 'time' => '23:00'], ['movie' => 'Movie 7', 'channel' => 'Channel 4', 'time' => '11:15'], ['movie' => 'Movie 11', 'channel' => 'Channel 4', 'time' => '21:00'], ['movie' => 'Movie 16', 'channel' => 'Channel 2', 'time' => '23:45'], ['movie' => 'Movie 20', 'channel' => 'Channel 4', 'time' => '23:00'], ['movie' => 'Movie 23', 'channel' => 'Channel 5', 'time' => '01:00'], ['movie' => 'Movie 27', 'channel' => 'Channel 4', 'time' => '01:00'], ['movie' => 'Movie 29', 'channel' => 'Channel 7', 'time' => '02:15'], ['movie' => 'Movie 31', 'channel' => 'Channel 5', 'time' => '14:00'], ['movie' => 'Movie 32', 'channel' => 'Channel 5', 'time' => '22:10'], ['movie' => 'Movie 36', 'channel' => 'Channel 2', 'time' => '00:01'], ['movie' => 'Movie 37', 'channel' => 'Channel 2', 'time' => '11:30'], ['movie' => 'Movie 38', 'channel' => 'Channel 6', 'time' => '22:30'] ], '2021-07-09' => [ ['movie' => 'Movie 4', 'channel' => 'Channel 5', 'time' => '21:00'], ['movie' => 'Movie 9', 'channel' => 'Channel 11', 'time' => '22:00'], ['movie' => 'Movie 10', 'channel' => 'Channel 9', 'time' => '16:45'], ['movie' => 'Movie 18', 'channel' => 'Channel 7', 'time' => '22:00'], ['movie' => 'Movie 22', 'channel' => 'Channel 5', 'time' => '23:00'], ['movie' => 'Movie 24', 'channel' => 'Channel 9', 'time' => '21:00'], ['movie' => 'Movie 25', 'channel' => 'Channel 9', 'time' => '23:00'], ] ]; ksort($program); array_walk($program, fn(&$row) => usort($row, fn($a, $b) => $a['time'] <=> $b['time'])); var_export($program);