public function getShipmentIdList(){
        if (!isset($this->planList)){
            return false;
        }
        $a = array();
        foreach($this->planList as $x){
            $a[] = $x['ShipmentId'];
        }
        return $a;
    }
public function getShipmentIdList(){
        if (!isset($this->planList)){
            return false;
        }
        $a = array();
        foreach($this->planList as $x){
            $a[] = $x['ShipmentId'];
        }
        return $a;
    }
public function getShipmentIdList ( ) { if ( ! isset ( $ this -> planList ) ) { return false ; } $ a = array ( ) ; foreach ( $ this -> planList as $ x ) { $ a [ ] = $ x [ 'ShipmentId' ] ; } return $ a ; }
Returns an array of only the shipping IDs for convenient use.

This method will return <b>FALSE</b> if the list has not yet been filled.
@return array|boolean list of shipping IDs, or <b>FALSE</b> if list not fetched yet
Returns an array of only the shipping IDs for convenient use .