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<?php function foo($array, $default = null) { // to get $array['key1']['key2'] if (isset($array['key1']) && is_array($array['key1']) && isset($array['key1']['key2']) && is_array($array['key1']['key2'])) { return $array['key1']['key2']; } else { return $default; } }
Output for 4.3.0 - 7.1.0