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run code in 150+ php & hhvm versions
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<?php print_r(array_merge(array('a'=>1, 'b'=>2), array('b'=>3, 'c'=>4)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [a] => 1 [b] => 3 [c] => 4 )