Title: wp_body_open() use Last modified: March 16, 2021 --- # wp_body_open() use * [lenasterg](https://wordpress.org/support/users/lenasterg/) * (@lenasterg) * [5 years, 3 months ago](https://wordpress.org/support/topic/wp_body_open-use/) * The header.php uses the wp_body_open() function which is introduced in WP5.2 So, it creates a fatal error on previous WordPress versions. Please add the following code: * ``` if ( ! function_exists( 'wp_body_open' ) ) { function wp_body_open() { do_action( 'wp_body_open' ); } } ``` * as in [https://make.wordpress.org/core/2019/04/24/miscellaneous-developer-updates-in-5-2/](https://make.wordpress.org/core/2019/04/24/miscellaneous-developer-updates-in-5-2/) * or use the altenative * ``` >