Log a warning when headers were already sent and we can't

Change-Id: Id01f4712e3dd297594e9ed2389ad411be5f553e7

diff --git a/includes/WebResponse.php b/includes/WebResponse.php
index 339b2e3..f5fb47f 100644 (file)
--- a/includes/WebResponse.php
+++ b/includes/WebResponse.php
@@ -39,6 +39,9 @@ class WebResponse {
         * @param null|int $http_response_code Forces the HTTP response code to the specified value.
         */
        public function header( $string, $replace = true, $http_response_code = null ) {
+               if ( headers_sent() ) {
+                       MWDebug::warning( 'Headers already sent, should send headers earlier than ' . wfGetCaller() );
+               }
                if ( $http_response_code ) {
                        header( $string, $replace, $http_response_code );
                } else {