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<?php preg_match('(a(b(c)))', 'abcabc', $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(3) "abc" [1]=> string(2) "bc" [2]=> string(1) "c" }