wp-includes/deprecated.php:831Print list of pages based on arguments.
$beforestringoptional'<br />'$afterstringoptional'<br />'$next_or_numberstringoptional'number'$nextpagelinkstringoptional'next page'$previouspagelinkstringoptional'previous page'$pagelinkstringoptional'%'$more_filestringoptional''stringfunction link_pages($before='<br />', $after='<br />', $next_or_number='number', $nextpagelink='next page', $previouspagelink='previous page', $pagelink='%', $more_file='') { _deprecated_function( __FUNCTION__, '2.1.0', 'wp_link_pages()' ); $args = compact('before', 'after', 'next_or_number', 'nextpagelink', 'previouspagelink', 'pagelink', 'more_file'); return wp_link_pages($args);}Introduced in 0.71. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.