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<?php $times = array( '2:00pm', '7:30pm', '8:00pm', ); //sort($times); //print_r($times); $results = array(array()); foreach ($times as $time_range) { foreach ($results as $combination) { array_push($results, array_merge(array($time_range), $combination)); } } //sort($results); array_multisort($results); print_r($results);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( ) [1] => Array ( [0] => 2:00pm ) [2] => Array ( [0] => 7:30pm ) [3] => Array ( [0] => 8:00pm ) [4] => Array ( [0] => 7:30pm [1] => 2:00pm ) [5] => Array ( [0] => 8:00pm [1] => 2:00pm ) [6] => Array ( [0] => 8:00pm [1] => 7:30pm ) [7] => Array ( [0] => 8:00pm [1] => 7:30pm [2] => 2:00pm ) )

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