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<?php preg_match('/(?P<year>[0-9]+)/', '2005', $m); var_dump($m);
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(4) "2005" ["year"]=> string(4) "2005" [1]=> string(4) "2005" }
Output for 4.3.0 - 4.3.2
array(2) { [0]=> string(4) "2005" [1]=> string(4) "2005" }