File includes/types/CMB2_Type_Taxonomy_Multicheck_Hierarchical.php

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<?php
/**
 * CMB taxonomy_multicheck_hierarchical field type
 *
 * @since  2.2.5
 *
 * @category  WordPress_Plugin
 * @package   CMB2
 * @author    CMB2 team
 * @license   GPL-2.0+
 * @link      https://cmb2.io
 */
class CMB2_Type_Taxonomy_Multicheck_Hierarchical extends CMB2_Type_Taxonomy_Multicheck {

    /**
     * Parent term ID when looping hierarchical terms.
     *
     * @var integer
     */
    protected $parent = 0;

    public function render() {
        return $this->rendered(
            $this->types->radio( array(
                'class'   => $this->get_wrapper_classes(),
                'options' => $this->get_term_options(),
            ), 'taxonomy_multicheck_hierarchical' )
        );
    }

    protected function list_term_input( $term, $saved_terms ) {
        $options = parent::list_term_input( $term, $saved_terms );
        $children = $this->build_children( $term, $saved_terms );

        if ( ! empty( $children ) ) {
            $options .= $children;
        }

        return $options;
    }

}

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