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run code in 150+ php & hhvm versions
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<?php $input = array("a" => "green", "red", "b" => "green", "blue", "red"); $result = array_unique($input,SORT_REGULAR); print_r($result);
Output for 5.2.9 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [a] => green [0] => red [1] => blue )
Output for 4.3.0 - 5.2.8
Warning: Wrong parameter count for array_unique() in /in/PVTlA on line 4