WordPress at a glance
filter is not described

contextual_help filter-hook . WP 2.7.0

Deprecated in 3.3.0. It is no longer supported and can be removed in future releases. Use get_current_screen()->add_help_tab() or get_current_screen()->remove_help_tab() instead.

Deprecated: 3.3.0 Use get_current_screen()->add_help_tab() or
get_current_screen()->remove_help_tab() instead.

Filters the legacy contextual help text.

Usage

add_filter( 'contextual_help', 'filter_function_name_6298', 10, 3 );
function filter_function_name_6298( $old_help, $screen_id, $this ){
	// filter...

	return $old_help;
}
$old_help(string)
Help text that appears on the screen.
$screen_id(string)
Screen ID.
$this(WP_Screen)
Current WP_Screen instance.

Where the hook is called

WP_Screen::render_screen_meta()
wp-admin/includes/class-wp-screen.php 763
$old_help = apply_filters( 'contextual_help', $old_help, $this->id, $this );

Where the hook is used (in WP core)

Does not used.