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当前路径:Classes/PHPExcel/Calculation/Functions.php
<?php

/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
    /**
     * @ignore
     */
    define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
    require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}


/** MAX_VALUE */
define('MAX_VALUE', 1.2e308);

/** 2 / PI */
define('M_2DIVPI', 0.63661977236758134307553505349006);

/** MAX_ITERATIONS */
define('MAX_ITERATIONS', 256);

/** PRECISION */
define('PRECISION', 8.88E-016);


/**
 * PHPExcel_Calculation_Functions
 *
 * Copyright (c) 2006 - 2015 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 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license        http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version        ##VERSION##, ##DATE##
 */
class PHPExcel_Calculation_Functions
{

    /** constants */
    const COMPATIBILITY_EXCEL      = 'Excel';
    const COMPATIBILITY_GNUMERIC   = 'Gnumeric';
    const COMPATIBILITY_OPENOFFICE = 'OpenOfficeCalc';

    const RETURNDATE_PHP_NUMERIC = 'P';
    const RETURNDATE_PHP_OBJECT  = 'O';
    const RETURNDATE_EXCEL       = 'E';


    /**
     * Compatibility mode to use for error checking and responses
     *
     * @access    private
     * @var string
     */
    protected static $compatibilityMode = self::COMPATIBILITY_EXCEL;

    /**
     * Data Type to use when returning date values
     *
     * @access    private
     * @var string
     */
    protected static $returnDateType = self::RETURNDATE_EXCEL;

    /**
     * List of error codes
     *
     * @access    private
     * @var array
     */
    protected static $errorCodes = array(
        'null'           => '#NULL!',
        'divisionbyzero' => '#DIV/0!',
        'value'          => '#VALUE!',
        'reference'      => '#REF!',
        'name'           => '#NAME?',
        'num'            => '#NUM!',
        'na'             => '#N/A',
        'gettingdata'    => '#GETTING_DATA'
    );


    /**
     * Set the Compatibility Mode
     *
     * @access    public
     * @category Function Configuration
     * @param     string        $compatibilityMode        Compatibility Mode
     *                                                Permitted values are:
     *                                                    PHPExcel_Calculation_Functions::COMPATIBILITY_EXCEL            'Excel'
     *                                                    PHPExcel_Calculation_Functions::COMPATIBILITY_GNUMERIC        'Gnumeric'
     *                                                    PHPExcel_Calculation_Functions::COMPATIBILITY_OPENOFFICE    'OpenOfficeCalc'
     * @return     boolean    (Success or Failure)
     */
    public static function setCompatibilityMode($compatibilityMode)
    {
        if (($compatibilityMode == self::COMPATIBILITY_EXCEL) ||
            ($compatibilityMode == self::COMPATIBILITY_GNUMERIC) ||
            ($compatibilityMode == self::COMPATIBILITY_OPENOFFICE)) {
            self::$compatibilityMode = $compatibilityMode;
            return true;
        }
        return false;
    }


    /**
     * Return the current Compatibility Mode
     *
     * @access    public
     * @category Function Configuration
     * @return     string        Compatibility Mode
     *                            Possible Return values are:
     *                                PHPExcel_Ca...
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