public function getSku($i = 0){
        if (isset($this->prepList[$i]['SellerSKU'])){
            return $this->prepList[$i]['SellerSKU'];
        } else {
            return false;
        }
    }
public function getSku($i = 0){
        if (isset($this->prepList[$i]['SellerSKU'])){
            return $this->prepList[$i]['SellerSKU'];
        } else {
            return false;
        }
    }
public function getSku ( $ i = 0 ) { if ( isset ( $ this -> prepList [ $ i ] [ 'SellerSKU' ] ) ) { return $ this -> prepList [ $ i ] [ 'SellerSKU' ] ; } else { return false ; } }
Returns the Seller SKU for the specified item preperation instruction.

Prep instructions will only include this data if SKUs were sent when
retrieving the list of prep instructions.
This method will return <b>FALSE</b> if the list has not yet been filled.
@param int $i [optional] <p>List index to retrieve the value from. Defaults to 0.</p>
@return string|boolean single value, or <b>FALSE</b> if Non-numeric index
Returns the Seller SKU for the specified item preperation instruction .