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<?php function traverseArray(array $a, array $keys) { $tmp = $a; foreach ($keys as $key) { if (!isset($tmp[$key])) { return null; } $tmp = $tmp[$key]; } return $tmp; } var_dump(traverseArray(array('a' => array('b' => array('c' => array('d' => 5)))), array('a', 'b', 'c', 'd')));
Output for 5.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2, hhvm-3.17.3, 7.0.0 - 7.2.0
int(5)
Output for hhvm-3.12.14, hhvm-3.15.4

Process exited with code 137.