Retrieves the current user object.

Will set the current user, if the current user is not set. The current user
will be set to the logged-in person. If no user is logged-in, then it will
set the current user to 0, which is invalid and won’t have any permissions.

function wp_get_current_user() {
		return _wp_get_current_user();
	}
endif;

if ( ! function_exists( 'get_userdata' ) ) :
	/**
	 * Retrieves user info by user ID.
	 *
	 * @since 0.71
	 *
	 * @param int $user_id User ID
	 * @return WP_User|false WP_User object on success, false on failure.
	 */