fix the undefined error

libraries/display_export.lib.php

@@ -62,7 +62,7 @@ $html .= PMA_getHtmlForExportOptions(
     $multi_values, 
     $num_tables_str, 
     $export_list,
-    $unlim_num_rows
+    $unlim_num_rows_str
 );
 
 $html .= '</form>';

libraries/server_export.lib.php

@@ -685,7 +685,7 @@ function PMA_getHtmlForExportOptions(
     $num_tables, $export_list, $unlim_num_rows
 ) {
     global $cfg;
-    $html .= PMA_getHtmlForExportOptionHeader($export_type, $db, $table);
+    $html  = PMA_getHtmlForExportOptionHeader($export_type, $db, $table);
     $html .= PMA_getHtmlForExportOptionsMethod();
     $html .= PMA_getHtmlForExportOptionsSelection($export_type, $multi_values);
   

server_export.php

@@ -1,6 +1,7 @@
 <?php
 /* vim: set expandtab sw=4 ts=4 sts=4: */
 /**
+ * object the server export page
  *
  * @package PhpMyAdmin
  */

server_plugins.php

@@ -1,6 +1,7 @@
 <?php
 /* vim: set expandtab sw=4 ts=4 sts=4: */
 /**
+ * object the server plugin page
  *
  * @package PhpMyAdmin
  */