WordPress at a glance
filter is not described

shake_error_codes filter-hook . WP 3.0.0

Filters the error codes array for shaking the login form.

Usage

add_filter( 'shake_error_codes', 'filter_function_name_4929' );
function filter_function_name_4929( $shake_error_codes ){
	// filter...

	return $shake_error_codes;
}
$shake_error_codes(array)
Error codes that shake the login form.

Where the hook is called

login_header()
shake_error_codes
wp-login.php 54
$shake_error_codes = apply_filters( 'shake_error_codes', $shake_error_codes );

Where the hook is used (in WP core)

Does not used.