WordPress Version: 4.6
/**
* Displays the post pages link navigation for previous and next pages.
*
* @since 0.71
*
* @param string $sep Optional. Separator for posts navigation links. Default empty.
* @param string $prelabel Optional. Label for previous pages. Default empty.
* @param string $nxtlabel Optional Label for next pages. Default empty.
*/
function posts_nav_link($sep = '', $prelabel = '', $nxtlabel = '')
{
$args = array_filter(compact('sep', 'prelabel', 'nxtlabel'));
echo get_posts_nav_link($args);
}