functions.php

<?php 
// Visual composer get terms on dropdown params
if( !function_exists('vcdd_get_terms') ){
	function vcdd_get_terms( $taxonomy = 'category' ){
	    $get_categories = get_categories( array(
	        'taxonomy' => $taxonomy,
	    ) );
	    foreach ( $get_categories as $category ) {
	        $categories[] = [ $category->term_id => $category->name ];
	    }
	    return $categories;
	}
}

/**
 * use vcdd_get_terms('taxonomy'); on visual composer addon vc_map() as dropdown value
 * @return term id(s)
 */
/*
array(
	'type' => 'dropdown',
	'holder' => 'div',
	'heading' => __('Select Cetegory', 'gasthof') ,
	'param_name' => 'category',
	'admin_label' => '',
	'weight' => '',
	'group' => __('General', 'gasthof') ,
	'value' => vcdd_get_terms('ait-item-category') , //get values from 'ait-item-category' category
	'std' => 'no',
) ,
*/