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run code in 150+ php & hhvm versions
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<?php function f(&$obst) { $obst['birne'] = 'gelb'; return $obst; } $obst['apfel'] = 'gruen'; $obst = f($obst); var_dump($obst['apfel']);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(5) "gruen"