wp-admin/includes/deprecated.php:997Add contextual help text for a page.
$screenstring$helpstringfunction add_contextual_help( $screen, $help ) { _deprecated_function( __FUNCTION__, '3.3.0', 'get_current_screen()->add_help_tab()' ); if ( is_string( $screen ) ) $screen = convert_to_screen( $screen ); WP_Screen::add_old_compat_help( $screen, $help );}Introduced in 2.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.