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

Process exited with code 137.