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run code in 150+ php & hhvm versions
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<?php $a = array('test' => 1, 'toto' => 2); $b = array('test' => 'test'); $a = array_merge($b,$a); print_r($a);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [test] => 1 [toto] => 2 )
Output for hhvm-3.10.0

Process exited with code 153.