get_posts_nav_link() WordPress Function

function get_posts_nav_link( $args = array() ) {
	global $wp_query;

	$return = '';

	if ( ! is_singular() ) {
		$defaults = array(
			'sep'      => ' &#8212; ',
			'prelabel' => __( '&laquo; Previous Page' ),
			'nxtlabel' => __( 'Next Page &raquo;' ),
		);
		$args     = wp_parse_args( $args, $defaults );

		$max_num_pages = $wp_query->max_num_pages;
		$paged         = get_query_var( 'paged' );

		// Only have sep if there's both prev and next results.
		if ( $paged < 2 || $paged >= $max_num_pages ) {
			$args['sep'] = '';
		}

		if ( $max_num_pages > 1 ) {
			$return  = get_previous_posts_link( $args['prelabel'] );
			$return .= preg_replace( '/&([^#])(?![a-z]{1,8};)/i', '&#038;$1', $args['sep'] );
			$return .= get_next_posts_link( $args['nxtlabel'] );
		}
	}
	return $return;

}
Uses	Description
wp-includes/l10n.php:__()	Retrieve the translation of $text.
wp-includes/query.php:is_singular()	Determines whether the query is for an existing single post of any post type (post, attachment, page, custom post types).
wp-includes/query.php:get_query_var()	Retrieves the value of a query variable in the WP_Query class.
wp-includes/functions.php:wp_parse_args()	Merges user defined arguments into defaults array.
wp-includes/link-template.php:get_previous_posts_link()	Retrieves the previous posts page link.
wp-includes/link-template.php:get_next_posts_link()	Retrieves the next posts page link.