也在wp-config.php, 设置WP_DEBUG_DISPLAY 常数至FALSE.
源代码段wp-includes/default-constants.php:
// Add define(\'WP_DEBUG_DISPLAY\', null); to wp-config.php use the globally configured setting for
// display_errors and not force errors to be displayed. Use false to force display_errors off.
if ( !defined(\'WP_DEBUG_DISPLAY\') )
define( \'WP_DEBUG_DISPLAY\', true );