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