switch ($type) {
    case '1':
        $size = ($_REQUEST['size']);
        if (preg_match('/^(0|b[1-9]|[1-9][0-9]{1,6})(.[0-9]{1,2}+)?$/', $size)) {
            $optValue = $size;
            $optName = $categories[$type - 1][1];
            break;
        } else {
            header("location: ../views/productAdd.php");
            return;
        }
    case '2':
        $bWeight = ($_REQUEST['bWeight']);
        if (preg_match('/^(0|b[1-9]|[1-9][0-9]{1,6})(.[0-9]{1,2}+)?$/', $bWeight)) {
            $optValue = $bWeight;
            $optName = $categories[$type - 1][1];
            break;
        } else {
            header("location: ../views/productAdd.php");
            return;
        }
    case '3':
        $tempH = ($_REQUEST['fHeight']);
        $tempW = ($_REQUEST['fWidth']);
        $tempL = ($_REQUEST['fLenght']);
        if (preg_match('/^(0|b[1-9]|[1-9][0-9]{1,6})(.[0-9]{1,2}+)?$/', $tempH)) {
            $fHeight = $tempH;
        }
        if (preg_match('/^(0|b[1-9]|[1-9][0-9]{1,6})(.[0-9]{1,2}+)?$/', $tempW)) {
            $fWidth = $tempW;
        }
        if (preg_match('/^(0|b[1-9]|[1-9][0-9]{1,6})(.[0-9]{1,2}+)?$/', $tempL)) {
            $fLenght = $tempL;
        }

        if (!isset($fHeight, $fWidth, $fLenght)) {
            header("location: ../views/productAdd.php");
            return;
        }

        $optValue = $fHeight . 'x' . $fWidth . 'x' . $fLenght;
        $optName = $categories[$type - 1][1];
        break;
}

class Type
{
    public $type;

    function __construct($type)
    {
        $this->temp = $type;
    }

    function fetchType()
    {
        include "../config/categories.php";
        $val = ($_REQUEST[$categories[$this->temp - 1][3]]);
        if (preg_match('/^(0|b[1-9]|[1-9][0-9]{1,6})(.[0-9]{1,2}+)?$/', $val)) {
            return $val;
        }
    }
}

define('VALID_DIMENSION_PATTERN', '/^(0|b[1-9]|[1-9][0-9]{1,6})(.[0-9]{1,2}+)?$/')

if (preg_match(VALID_DIMENSION_PATTERN, $bWeight)) {

function valid_dimension($dimension) {
   return preg_match(VALID_DIMENSION_PATTERN, $dimension)
}

if (valid_dimension($bWeight)) {

function valid_dimensions(...$dimensions) {
   foreach($dimensions as $dimension) {
     if (!preg_match(VALID_DIMENSION_PATTERN, $dimension))
       return FALSE;
   }
   return TRUE;
}

if (valid_dimensions($tempH, $tempW, $tempL)) {