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