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<?php $array1 = array(2,2,3,5,7); $array2 = array(2,3,5,23); foreach($array1 as $value) { if (in_array($value,$array2) && !in_array($value,$output["greens"])) { $output["greens"][]=$value; } else { $output["reds"][]=$value; } } print_r($output);

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