Index: wp-admin/admin-header.php
===================================================================
--- wp-admin/admin-header.php	(revision 49071)
+++ wp-admin/admin-header.php	(working copy)
@@ -201,10 +201,11 @@
 $error_get_last = error_get_last();
 
 // Print a CSS class to make PHP errors visible.
-if ( $error_get_last && WP_DEBUG && WP_DEBUG_DISPLAY && ini_get( 'display_errors' )
+if ( $error_get_last && WP_DEBUG && WP_DEBUG_DISPLAY && ini_get( 'display_errors' ) 
 	// Don't print the class for PHP notices in wp-config.php, as they happen before WP_DEBUG takes effect,
 	// and should not be displayed with the `error_reporting` level previously set in wp-load.php.
-	&& ( E_NOTICE !== $error_get_last['type'] || 'wp-config.php' !== wp_basename( $error_get_last['file'] ) )
+	&& ( E_NOTICE !== $error_get_last['type'] || 'wp-config.php' !== wp_basename( $error_get_last['file'] ) ) 
+	&& ( E_WARNING !== $error_get_last['type'] )
 ) {
 	$admin_body_class .= ' php-error';
 }