process shortcode

<?php
  echo do_shortcode("[av_submenu which_menu='' menu='274' position='center' color='main_color' sticky='aviaTBsticky' mobile='disabled']
[av_submenu_item title='Menu Item 1' link='' linktarget='no' button_style='']
[av_submenu_item title='Menu Item 2' link='' linktarget='no' button_style='']
[/av_submenu]");
?>