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<?php $dateTime = '2007-01-11 12:34:56'; preg_match('~(?<date>\d{4}-\d{2}-\d{2})\s?(?<time>\d{2}:\d{2}:\d{2})?~', $dateTime, $matches); $matches['time'] = array_key_exists('time', $matches) ? $matches['time'] :'00:00:00'; var_dump($matches); $dateTime = vsprintf('%1s %4s', $matches); var_dump($dateTime);
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.1
array(5) { [0]=> string(19) "2007-01-11 12:34:56" ["date"]=> string(10) "2007-01-11" [1]=> string(10) "2007-01-11" ["time"]=> string(8) "12:34:56" [2]=> string(8) "12:34:56" } string(30) "2007-01-11 12:34:56 2007-01-11"