next_posts( int $max_page, bool $echo = true )

Source

File: wp-includes/link-template.php

function next_posts( $max_page = 0, $echo = true ) {
	$output = esc_url( get_next_posts_page_link( $max_page ) );

	if ( $echo ) {
		echo $output;
	} else {
		return $output;
	}
}