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run code in 150+ php & hhvm versions
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<?php $a1=array("a"=>"Horse","b"=>"Dog"); $a2=array("c"=>"Cow","b"=>"Cat"); print_r(array_merge($a1,$a2)); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [a] => Horse [b] => Cat [c] => Cow )
Output for hhvm-3.10.0

Process exited with code 153.