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diff --git a/admin/survey/excel/PHPExcel/Calculation/ExceptionHandler.php b/admin/survey/excel/PHPExcel/Calculation/ExceptionHandler.php
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+<?php
+/**
+ * PHPExcel
+ *
+ * Copyright (c) 2006 - 2012 PHPExcel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_Calculation
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ * @license	http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
+ * @version	1.7.8, 2012-10-12
+ */
+
+/**
+ * PHPExcel_Calculation_ExceptionHandler
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_Calculation
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_Calculation_ExceptionHandler {
+	/**
+	 * Register errorhandler
+	 */
+	public function __construct() {
+		set_error_handler(array('PHPExcel_Calculation_Exception', 'errorHandlerCallback'), E_ALL);
+	}
+
+	/**
+	 * Unregister errorhandler
+	 */
+	public function __destruct() {
+		restore_error_handler();
+	}
+}