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<?php
function vi_vc_accordion()
{
    vc_map(array(
        'base'   => 'vi_sc_accordion',
        'name'   => 'viAccordion',
        'params' => array(
            array(
                'type'        => 'textfield',
                'heading'     => 'Tiêu đề',
                'param_name'  => 'title',
                'description' => '',
                'admin_label' => true
            ),
            array(
                'type' => 'param_group',
                'heading' => 'Các nhóm',
                'param_name' => 'items',
                'params' => array(
                    /** params */
                )
            ),
            
            #...
        )
    ));
}

add_action('init', 'vi_vc_accordion');