vendor/PHPExcel/Classes/PHPExcel/Writer/Excel2007/StringTable.php

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<?php

/**
 * PHPExcel_Writer_Excel2007_StringTable
 *
 * 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_Writer_Excel2007
 * @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_Writer_Excel2007_StringTable extends PHPExcel_Writer_Excel2007_WriterPart
{
    /**
     * Create worksheet stringtable
     *
     * @param     PHPExcel_Worksheet     $pSheet                Worksheet
     * @param     string[]                 $pExistingTable     Existing table to eventually merge with
     * @return     string[]                 String table for worksheet
     * @throws     PHPExcel_Writer_Exception
     */
    public function createStringTable($pSheet = null, $pExistingTable = null)
    {
        if ($pSheet !== null) {
            // Create string lookup table
            $aStringTable = array();
            $cellCollection = null;
            $aFlippedStringTable = null;    // For faster lookup

            // Is an existing table given?
            if (($pExistingTable !== null) && is_array($pExistingTable)) {
                $aStringTable = $pExistingTable;
            }

            // Fill index array
            $aFlippedStringTable = $this->flipStringTable($aStringTable);

            // Loop through cells
            foreach ($pSheet->getCellCollection() as $cellID) {
                $cell = $pSheet->getCell($cellID);
                $cellValue = $cell->getValue();
                if (!is_object($cellValue) &&
                    ($cellValue !== null) &&
                    $cellValue !== '' &&