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<?php $dateTime = '2007-01-11'; preg_match('~(?<date>\d{4}-\d{2}-\d{2})\s?(?<time>\d{2}:\d{2}:\d{2})?~', $dateTime, $matches); var_dump($matches);
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.1
array(3) { [0]=> string(10) "2007-01-11" ["date"]=> string(10) "2007-01-11" [1]=> string(10) "2007-01-11" }