Ticket #64256: 64256.patch

wp-includes/functions.php

@@ -3886 +3886 @@
                 $message  .= "\n<p><a href='javascript:history.back()'>$back_text</a></p>";
         }
 
+        // Ensure HTTP 500 status code for critical errors, even if headers were already sent.
+        // Check for fatal errors using error code 'internal_server_error' (language-independent).
+        $is_critical_error = false;
+        if ( function_exists( 'is_wp_error' ) && is_wp_error( $message ) ) {
+                $error_code = $message->get_error_code();
+                $is_critical_error = ( 'internal_server_error' === $error_code );
+        } elseif ( 'internal_server_error' === $parsed_args['code'] ) {
+                $is_critical_error = true;
+        }
+
+        // Also ensure HTTP 500 if response is already set to 500 (from fatal error handler).
+        if ( $is_critical_error || 500 === $parsed_args['response'] ) {
+                $parsed_args['response'] = 500;
+                // Set HTTP status code even if headers were already sent.
+                if ( function_exists( 'http_response_code' ) ) {
+                        http_response_code( 500 );
+                }
+        }
+
         if ( ! did_action( 'admin_head' ) ) :
                 if ( ! headers_sent() ) {
                         header( "Content-Type: text/html; charset={$parsed_args['charset']}" );