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<?php function returnArray() { return array(591=>1,12354=>2,12=>45); } $foo = array(434=>99,2354=>98); array_merge(returnArray(), $foo); var_dump($foo);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [434]=> int(99) [2354]=> int(98) }