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

Process exited with code 153.