wp-includes/error-protection.php:81Registers the shutdown handler for fatal errors.
function wp_register_fatal_error_handler() { if ( ! wp_is_fatal_error_handler_enabled() ) { return; } $handler = null; if ( defined( 'WP_CONTENT_DIR' ) && is_readable( WP_CONTENT_DIR . '/fatal-error-handler.php' ) ) { $handler = include WP_CONTENT_DIR . '/fatal-error-handler.php'; } if ( ! is_object( $handler ) || ! is_callable( array( $handler, 'handle' ) ) ) { $handler = new WP_Fatal_Error_Handler(); } register_shutdown_function( array( $handler, 'handle' ) );}Introduced in 5.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/error-protection.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.