wp-includes/link-template.php:2511Retrieves the next posts page link.
$max_pageintoptional0string|voidfunction get_next_posts_page_link( $max_page = 0 ) { global $paged; if ( ! is_single() ) { if ( ! $paged ) { $paged = 1; } $next_page = (int) $paged + 1; if ( ! $max_page || $max_page >= $next_page ) { return get_pagenum_link( $next_page ); } }}Introduced in 2.0.10. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
string|void to string|null.verified against sourcesrc/wp-includes/link-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.