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run code in 150+ php & hhvm versions
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<?php $productStates = '1,3,3'; var_dump(is_array($productStates)); $array = explode(",",$productStates); print_r($array);
based on vReo2
Output for 4.3.0 - 7.1.0
bool(false) Array ( [0] => 1 [1] => 3 [2] => 3 )