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run code in 150+ php & hhvm versions
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<?php $a=array("a"=>"red","b"=>"green","c"=>"red"); array_unique($a); print_r($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [a] => red [b] => green [c] => red )