header.inc.php3: Don't allow including this file twice.

ChangeLog

@@ -12,6 +12,7 @@ $Source$
     * libraries/display_export.lib.php3, libraries/export/csv.php3,
       libraries/config_import.lib.php3, config.inc.php3: Allow column headers
       for Excel export (bug #771299).
+    * header.inc.php3: Don't allow including this file twice.
 
 2003-08-05 Marc Delisle  <lem9@users.sourceforge.net>
     * libraries/sqlparser.data.php3: bug 779453, wrong count

header.inc.php3

@@ -2,6 +2,9 @@
 /* $Id$ */
 // vim: expandtab sw=4 ts=4 sts=4:
 
+if (!defined('PMA_HEADER_INC_INCLUDED')) {
+    define('PMA_HEADER_INC_INCLUDED', 1);
+
     /**
      * Gets a core script and starts output buffering work
      */
@@ -155,4 +158,5 @@ echo "\n";
      * Sets a variable to remember headers have been sent
      */
     $GLOBALS['is_header_sent'] = TRUE;
+} // PMA_HEADER_INC_INCLUDED
 ?>