eventespresso / event-espresso-core

        // register messenger metaboxes

        $m_template_path = EE_MSG_TEMPLATE_PATH . 'ee_msg_details_messenger_mt_meta_box.template.php';

        foreach ($m_boxes as $box => $label) {

            $callback_args = array('template_path' => $m_template_path, 'template_args' => $m_template_args[ $box ]);

            $msgr = str_replace('_a_box', '', $box);

            add_meta_box(

                'espresso_' . $msgr . '_settings',

                $label,

                function ($post, $metabox) {

                    echo EEH_Template::display_template(

                        $metabox["args"]["template_path"],

                        $metabox["args"]["template_args"],

                        true

                    );

                },

                $this->_current_screen->id,

                'normal',

                'high',

                $callback_args

            );

        // register message type metaboxes

        $mt_template_path = EE_MSG_TEMPLATE_PATH . 'ee_msg_details_messenger_meta_box.template.php';

        foreach ($mt_boxes as $box => $label) {

            $callback_args = array(

                'template_path' => $mt_template_path,

                'template_args' => $mt_template_args[ $box ],

            );

            $mt = str_replace('_i_box', '', $box);

            add_meta_box(

                'espresso_' . $mt . '_inactive_mts',

                $label,

                function ($post, $metabox) {

                    echo EEH_Template::display_template(

                        $metabox["args"]["template_path"],

                        $metabox["args"]["template_args"],

                        true

                    );

                },

                $this->_current_screen->id,

                'side',

                'high',

                $callback_args