vendor/phpoffice/phpexcel/Classes/PHPExcel/Cell.php

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<?php
/**
 *	PHPExcel
 *
 *	Copyright (c) 2006 - 2014 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_Cell
 *	@copyright	Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 *	@license	http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 *	@version	##VERSION##, ##DATE##
 */


/**
 *	PHPExcel_Cell
 *
 *	@category   PHPExcel
 *	@package	PHPExcel_Cell
 *	@copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Cell
{

	/**
	 *  Default range variable constant
	 *
	 *  @var  string
	 */
	const DEFAULT_RANGE = 'A1:A1';

	/**
	 *	Value binder to use
	 *
	 *	@var	PHPExcel_Cell_IValueBinder
	 */
	private static $_valueBinder = NULL;

	/**
	 *	Value of the cell
	 *
	 *	@var	mixed
	 */
	private $_value;

	/**