PHP - Calculate Pairs In Tree Function

 <td> <input type="text" name="item[]" id="category" value="<?php echo $row1['item'];?>"  /></td>
 <td> <input type="text" name="uom[]" class="span2"  value="<?php echo $row1['uom'];?>"  /></td>
 <td> <input type="text" name="description[]" value="<?php echo $row1['description'];?>"  /></td>
 
 <td><input type="text" class="jQinv_item_qty span1" name="quantity[]"  /></td>
 
 <td><input type="text" class="jQinv_item_unit span1" name="price[]" value="<?php echo $row1['selling_price'];?>" /></td>
 

 <td><select name="tax[]" class="jQinv_item_tax span1">
 <option value="<?php echo $row1['tax'];?>"><?php echo $row1['tax'];?></option>
 <?php $l1 = mysql_query("select * from taxes") or die (mysql_error());
 while($l2 = mysql_fetch_array($l1))
 { ?>
 <option value="<?php echo $l2['rate']; ?>"> <?php echo $l2['name'];?> - <?php echo $l2['rate'];?>% </option>
 <?php } ?> </select></td>
 
 <td>
 <input type="text" class="jQinv_item_discount span1" name="discount[]"  value="<?php echo $row1['discount'];?>"  /></td>
 
<td><input type="text" class="jQinv_item_frt span1" name="freight[]"  placeholder="Freight"  /></td>
 
<td><input type="text" class="jQinv_item_frtax span1" name="freight_tax[]" placeholder="Frt Tax"   /></td>
 
<td><input type="text" class="jQinv_item_total span2" name="total[]"  /></td>

a =( ((Quantity * Price) - Discount) * (tax/100) )  + Freight + (Freight * (Freight tax/100))

 function rowInputs() {
            var balance = 0;
            var subTotal = 0;
            var taxTotal = 0;
            $(".invE_table tr").not('.last_row').each(function () {
                var $unit_price = $('.jQinv_item_unit', this).val();
                var $qty = $('.jQinv_item_qty', this).val();
                var $tax = $('.jQinv_item_tax', this).val();
var $discount = $('.jQinv_item_discount', this).val();
var $frt = $('.jQinv_item_frt', this).val();
var $frtax = $('.jQinv_item_frtax', this).val();
                
                var $total = (($unit_price * 1) * ($qty * 1))- $discount;
                var $tax_amount = (($total) *($tax/parseFloat("100")));
                var $total_amount = (($tax_amount) + ($frt)) + $frtax;
                
                
                var parsedTotal = parseFloat( ('0' + $total_amount).replace(/[^0-9-\.]/g, ''), 10 );
                var parsedTax = parseFloat( ('0' + $tax_amount).replace(/[^0-9-\.]/g, ''), 10 );
                var parsedSubTotal = parseFloat( ('0' + $total).replace(/[^0-9-\.]/g, ''), 10 );
                
                $('.jQinv_item_total',this).val(parsedTotal.toFixed(2));
                
                subTotal += parsedSubTotal;
                taxTotal += parsedTax;
                balance += parsedTotal;
                
            });
            var discount = parseFloat( ('0' + $('#inv_discount').val()).replace(/[^0-9-\.]/g, ''), 10 );
            var balance_disc = balance - discount;
            
            $(".invE_subtotal span").html(subTotal.toFixed(2));
            $(".invE_tax span").html(taxTotal.toFixed(2));
            $(".invE_discount span").html(discount.toFixed(2));
            $(".invE_balance span").html(balance_disc.toFixed(2));
        }

The client provides name/value pairs which are used to update something and I am currently using switch statements to direct the action based on the provided name, however, it is becoming increasingly more complicated.  Are there any standard approaches to doing so?  I am thinking of doing the following.  Any concerns?  Thanks

$c['fooService'] = function ($c) {
    return new Foo\FooService(
        new Foo\FooMapper(),
        new ApiConnector(),
        new Foo\FooNameValueUpdater(),
    );
};

$app->put('/foo/{id:[0-9]+}', function (Request $request, Response $response, $args) {
    return $this->fooResponder->update($response, $this->fooService->update($args['id'], $request->getParsedBody()));
});

Class FooService extends BarService
{
    public function __construct($mapper, $updater, $apiConnector) {
        $this->mapper = $mapper;
        $this->apiConnector = $apiConnector;
        $this->updater = $updater;
    }

    public function update($id, $params) {
        //$params=['name'=>'property1name', 'value'=>123]
        $this->updater->$params['name']($id, $params['value'], $this);
    }

    public function updateSomeStandardAction($id, $value, $propertyName) {
        //some code...
        $this->mapper->bla($id, $value, $propertyName);
    }

    public function updateSomeOtherStandardAction($id, $value, $propertyName) {
        //some code...
        $this->apiConnector->bla($id, $value, $propertyName);
    }
}

Class FooNameValueUpdater extends BarNameValueUpdater
{
    public function property1name($id, $value, $service) {
        $this->updateSomeStandardAction($id, $value, $service, 'property1name');
    }
    public function property2name($id, $value, $service) {
        $this->updateSomeStandardAction($id, $value, $service, 'property2name');
    }
    public function property3name($id, $value, $service) {
        $this->updateSomeStandardAction($id, $value, $service, 'property3name');
    }
    public function property4name($id, $value, $service) {
        $this->updateSomeStandardAction($id, $value, $service, 'property4name');
    }

    protected function updateSomeStandardAction($id, $value, $service, $propertyName) {
        //some code...
        $service->updateSomeStandardAction($id, $value, $propertyName);
    }

    protected function updateSomeOtherStandardAction($id, $value, $service, $propertyName) {
        //some code...
        $service->updateSomeOtherStandardAction($id, $value, $propertyName);
    }
}