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run code in 150+ php & hhvm versions
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<?php $array1 = array('hello'); $array2 = array('hello', 'world'); print_r( array_unique(array_merge($array1, $array2)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => hello [2] => world )