eventespresso / event-espresso-core

     */

    public function pushData($key, $value)

    {

        if (isset($this->jsdata[ $key ])

            && ! is_array($this->jsdata[ $key ])

        ) {

            throw new InvalidArgumentException(

                sprintf(

                    __(

                        'The value for %1$s is already set and it is not an array. The %2$s method can only be used to

                         push values to this data element when it is an array.',

                        'event_espresso'

                    ),

                    $key,

                    __METHOD__

                )

            );

        }

        $this->jsdata[ $key ][] = $value;

    }

    protected function verifyDataNotExisting($key)

    {

        if (isset($this->jsdata[ $key ])) {

            if (is_array($this->jsdata[ $key ])) {

                throw new InvalidArgumentException(

                    sprintf(

                        __(

                            'The value for %1$s already exists in the Registry::eejs object.

                            Overrides are not allowed. Since the value of this data is an array, you may want to use the

                            %2$s method to push your value to the array.',

                            'event_espresso'

                        ),

                        $key,

                        'pushData()'

                    )

                );

            }

            throw new InvalidArgumentException(

                sprintf(

                    __(