WordPress Version: 4.6
/**
* Clears the authentication cookie, logging the user out. This function is deprecated.
*
* @since 1.5.0
* @deprecated 2.5.0 Use wp_clear_auth_cookie()
* @see wp_clear_auth_cookie()
*/
function wp_clearcookie()
{
_deprecated_function(__FUNCTION__, '2.5.0', 'wp_clear_auth_cookie()');
wp_clear_auth_cookie();
}