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<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2013 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 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license             http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt   LGPL
 * @version             ##VERSION##, ##DATE##
 */


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


/**
 * PHPExcel_Calculation_LookupRef
 *
 * @category    PHPExcel
 * @package             PHPExcel_Calculation
 * @copyright   Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Calculation_LookupRef {


        /**
         * CELL_ADDRESS
         *
         * Creates a cell address as text, given specified row and column numbers.
         *
         * Excel Function:
         *              =ADDRESS(row, column, [relativity], [referenceStyle], [sheetText])
         *
         * @param       row                             Row number to use in the cell reference
         * @param       column                  Column number to use in the cell reference
         * @param       relativity              Flag indicating the type of reference to return
         *                                                              1 or omitted    Absolute
         *                                                              2                               Absolute row; relative column
         *                                                              3                               Relative row; absolute column
         *                                                              4                               Relative
         * @param       referenceStyle  A logical value that specifies the A1 or R1C1 reference style.
         *                                                              TRUE or omitted         CELL_ADDRESS returns an A1-style reference
         *                                                              FALSE                           CELL_ADDRESS returns an R1C1-style reference
         * @param       sheetText               Optional Name of worksheet to use
         * @return      string
         */
        public static function CELL_ADDRESS($row, $column, $relativity=1, $referenceStyle=True, $sheetText='') {
                $row            = PHPExcel_Calculation_Functions::flattenSingleValue($row);
                $column         = PHPExcel_Calculation_Functions::flattenSingleValue($column);
                $relativity     = PHPExcel_Calculation_Functions::flattenSingleValue($relativity);
                $sheetText      = PHPExcel_Calculation_Functions::flattenSingleValue($sheetText);

                if (($row < 1) || ($column < 1)) {
                        return PHPExcel_Calculation_Functions::VALUE();
                }

                if ($sheetText > '') {
                        if (strpos($sheetText,' ') !== False) { $sheetText = "'".$sheetText."'"; }
                        $sheetText .='!';
                }
                if ((!is_bool($referenceStyle)) || $referenceStyle) {
                        $rowRelative = $columnRelative = '$';
                        $column = PHPExcel_Cell::stringFromColumnIndex($column-1);
                        if (($relativity == 2) || ($relativity == 4)) { $columnRelative = ''; }
                        if (($relativity == 3) || ($relativity == 4)) { $rowRelative = ''; }
                        return $sheetText.$columnRelative.$column.$rowRelative.$row;
                } else {
                        if (($relativity == 2) || ($relativity == 4)) { $column = '['.$column.']'; }
                        if (($relativity == 3) || ($relativity == 4)) { $row = '['.$row.']'; }
                        return $sheetText.'R'.$row.'C'.$column;
                }
        }       //      function CELL_ADDRESS()


        /**
         * COLUMN
         *
         * Returns the column number of the given cell reference
         * If the cell reference is a range of cells, COLUMN returns the column numbers of each column in the reference as a horizontal array.
         * If cell reference is omitted, and the function is being called through the calculation engine, then it is assumed to be the
         *              reference of the cell in which the COLUMN function appears; otherwise this function returns 0.
         *
         * Excel Function:
         *              =COLUMN([cellAddress])
         *
         * @param       cellAddress             A reference to a range of cells for which you want the column numbers
         * @return      integer or array of integer
         */
        public static function COLUMN($cellAddress=Null) {
                if (is_null($cellAddress) || trim($cellAddress) === '') { return 0; }

                if (is_array($cellAddress)) {
                        foreach($cellAddress as $columnKey => $value) {
                                $columnKey = preg_replace('/[^a-z]/i','',$columnKey);
                                return (integer) PHPExcel_Cell::columnIndexFromString($columnKey);
                        }
                } else {
                        if (strpos($cellAddress,'!') !== false) {
                                list($sheet,$cellAddress) = explode('!',$cellAddress);
                        }
                        if (strpos($cellAddress,':') !== false) {
                                list($startAddress,$endAddress) = explode(':',$cellAddress);
                                $startAddress = preg_replace('/[^a-z]/i','',$startAddress);
                                $endAddress = preg_replace('/[^a-z]/i','',$endAddress);
                                $returnValue = array();
                                do {
                                        $returnValue[] = (integer) PHPExcel_Cell::columnIndexFromString($startAddress);
                                } while ($startAddress++ != $endAddress);
                                return $returnValue;
                        } else {
                                $cellAddress = preg_replace('/[^a-z]/i','',$cellAddress);
                                return (integer) PHPExcel_Cell::columnIndexFromString($cellAddress);
                        }
                }
        }       //      function COLUMN()


        /**
         * COLUMNS
         *
         * Returns the number of columns in an array or reference.
         *
         * Excel Function:
         *              =COLUMNS(cellAddress)
         *
         * @param       cellAddress             An array or array formula, or a reference to a range of cells for which you want the number of columns
         * @return      integer                 The number of columns in cellAddress
         */
        public static function COLUMNS($cellAddress=Null) {
                if (is_null($cellAddress) || $cellAddress === '') {
                        return 1;
                } elseif (!is_array($cellAddress)) {
                        return PHPExcel_Calculation_Functions::VALUE();
                }

                $x = array_keys($cellAddress);
                $x = array_shift($x);
                $isMatrix = (is_numeric($x));
                list($columns,$rows) = PHPExcel_Calculation::_getMatrixDimensions($cellAddress);

                if ($isMatrix) {
                        return $rows;
                } else {
                        return $columns;
                }
        }       //      function COLUMNS()


        /**
         * ROW
         *
         * Returns the row number of the given cell reference
         * If the cell reference is a range of cells, ROW returns the row numbers of each row in the reference as a vertical array.
         * If cell reference is omitted, and the function is being called through the calculation engine, then it is assumed to be the
         *              reference of the cell in which the ROW function appears; otherwise this function returns 0.
         *
         * Excel Function:
         *              =ROW([cellAddress])
         *
         * @param       cellAddress             A reference to a range of cells for which you want the row numbers
         * @return      integer or array of integer
         */
        public static function ROW($cellAddress=Null) {
                if (is_null($cellAddress) || trim($cellAddress) === '') { return 0; }

                if (is_array($cellAddress)) {
                        foreach($cellAddress as $columnKey => $rowValue) {
                                foreach($rowValue as $rowKey => $cellValue) {
                                        return (integer) preg_replace('/[^0-9]/i','',$rowKey);
                                }
                        }
                } else {
                        if (strpos($cellAddress,'!') !== false) {
                                list($sheet,$cellAddress) = explode('!',$cellAddress);
                        }
                        if (strpos($cellAddress,':') !== false) {
                                list($startAddress,$endAddress) = explode(':',$cellAddress);
                                $startAddress = preg_replace('/[^0-9]/','',$startAddress);
                                $endAddress = preg_replace('/[^0-9]/','',$endAddress);
                                $returnValue = array();
                                do {
                                        $returnValue[][] = (integer) $startAddress;
                                } while ($startAddress++ != $endAddress);
                                return $returnValue;
                        } else {
                                list($cellAddress) = explode(':',$cellAddress);
                                return (integer) preg_replace('/[^0-9]/','',$cellAddress);
                        }
                }
        }       //      function ROW()


        /**
         * ROWS
         *
         * Returns the number of rows in an array or reference.
         *
         * Excel Function:
         *              =ROWS(cellAddress)
         *
         * @param       cellAddress             An array or array formula, or a reference to a range of cells for which you want the number of rows
         * @return      integer                 The number of rows in cellAddress
         */
        public static function ROWS($cellAddress=Null) {
                if (is_null($cellAddress) || $cellAddress === '') {
                        return 1;
                } elseif (!is_array($cellAddress)) {
                        return PHPExcel_Calculation_Functions::VALUE();
                }

                $i = array_keys($cellAddress);
                $isMatrix = (is_numeric(array_shift($i)));
                list($columns,$rows) = PHPExcel_Calculation::_getMatrixDimensions($cellAddress);

                if ($isMatrix) {
                        return $columns;
                } else {
                        return $rows;
                }
        }       //      function ROWS()


        /**
         * HYPERLINK
         *
         * Excel Function:
         *              =HYPERLINK(linkURL,displayName)
         *
         * @access      public
         * @category Logical Functions
         * @param       string                  $linkURL                Value to check, is also the value returned when no error
         * @param       string                  $displayName    Value to return when testValue is an error condition
         * @param       PHPExcel_Cell   $pCell                  The cell to set the hyperlink in
         * @return      mixed   The value of $displayName (or $linkURL if $displayName was blank)
         */
        public static function HYPERLINK($linkURL = '', $displayName = null, PHPExcel_Cell $pCell = null) {
                $args = func_get_args();
                $pCell = array_pop($args);

                $linkURL                = (is_null($linkURL))           ? '' :  PHPExcel_Calculation_Functions::flattenSingleValue($linkURL);
                $displayName    = (is_null($displayName))       ? '' :  PHPExcel_Calculation_Functions::flattenSingleValue($displayName);

                if ((!is_object($pCell)) || (trim($linkURL) == '')) {
                        return PHPExcel_Calculation_Functions::REF();
                }

                if ((is_object($displayName)) || trim($displayName) == '') {
                        $displayName = $linkURL;
                }

                $pCell->getHyperlink()->setUrl($linkURL);

                return $displayName;
        }       //      function HYPERLINK()


        /**
         * INDIRECT
         *
         * Returns the reference specified by a text string.
         * References are immediately evaluated to display their contents.
         *
         * Excel Function:
         *              =INDIRECT(cellAddress)
         *
         * NOTE - INDIRECT() does not yet support the optional a1 parameter introduced in Excel 2010
         *
         * @param       cellAddress             $cellAddress    The cell address of the current cell (containing this formula)
         * @param       PHPExcel_Cell   $pCell                  The current cell (containing this formula)
         * @return      mixed                   The cells referenced by cellAddress
         *
         * @todo        Support for the optional a1 parameter introduced in Excel 2010
         *
         */
        public static function INDIRECT($cellAddress = NULL, PHPExcel_Cell $pCell = NULL) {
                $cellAddress    = PHPExcel_Calculation_Functions::flattenSingleValue($cellAddress);
                if (is_null($cellAddress) || $cellAddress === '') {
                        return PHPExcel_Calculation_Functions::REF();
                }

                $cellAddress1 = $cellAddress;
                $cellAddress2 = NULL;
                if (strpos($cellAddress,':') !== false) {
                        list($cellAddress1,$cellAddress2) = explode(':',$cellAddress);
                }

                if ((!preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_CELLREF.'$/i', $cellAddress1, $matches)) ||
                        ((!is_null($cellAddress2)) && (!preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_CELLREF.'$/i', $cellAddress2, $matches)))) {
                        if (!preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_NAMEDRANGE.'$/i', $cellAddress1, $matches)) {
                                return PHPExcel_Calculation_Functions::REF();
                        }

                        if (strpos($cellAddress,'!') !== FALSE) {
                                list($sheetName, $cellAddress) = explode('!',$cellAddress);
                                $sheetName = trim($sheetName, "'");
                                $pSheet = $pCell->getParent()->getParent()->getSheetByName($sheetName);
                        } else {
                                $pSheet = $pCell->getParent();
                        }

                        return PHPExcel_Calculation::getInstance()->extractNamedRange($cellAddress, $pSheet, FALSE);
                }

                if (strpos($cellAddress,'!') !== FALSE) {
                        list($sheetName,$cellAddress) = explode('!',$cellAddress);
                        $sheetName = trim($sheetName, "'");
                        $pSheet = $pCell->getParent()->getParent()->getSheetByName($sheetName);
                } else {
                        $pSheet = $pCell->getParent();
                }

                return PHPExcel_Calculation::getInstance()->extractCellRange($cellAddress, $pSheet, FALSE);
        }       //      function INDIRECT()


        /**
         * OFFSET
         *
         * Returns a reference to a range that is a specified number of rows and columns from a cell or range of cells.
         * The reference that is returned can be a single cell or a range of cells. You can specify the number of rows and
         * the number of columns to be returned.
         *
         * Excel Function:
         *              =OFFSET(cellAddress, rows, cols, [height], [width])
         *
         * @param       cellAddress             The reference from which you want to base the offset. Reference must refer to a cell or
         *                                                              range of adjacent cells; otherwise, OFFSET returns the #VALUE! error value.
         * @param       rows                    The number of rows, up or down, that you want the upper-left cell to refer to.
         *                                                              Using 5 as the rows argument specifies that the upper-left cell in the reference is
         *                                                              five rows below reference. Rows can be positive (which means below the starting reference)
         *                                                              or negative (which means above the starting reference).
         * @param       cols                    The number of columns, to the left or right, that you want the upper-left cell of the result
         *                                                              to refer to. Using 5 as the cols argument specifies that the upper-left cell in the
         *                                                              reference is five columns to the right of reference. Cols can be positive (which means
         *                                                              to the right of the starting reference) or negative (which means to the left of the
         *                                                              starting reference).
         * @param       height                  The height, in number of rows, that you want the returned reference to be. Height must be a positive number.
         * @param       width                   The width, in number of columns, that you want the returned reference to be. Width must be a positive number.
         * @return      string                  A reference to a cell or range of cells
         */
        public static function OFFSET($cellAddress=Null,$rows=0,$columns=0,$height=null,$width=null) {
                $rows           = PHPExcel_Calculation_Functions::flattenSingleValue($rows);
                $columns        = PHPExcel_Calculation_Functions::flattenSingleValue($columns);
                $height         = PHPExcel_Calculation_Functions::flattenSingleValue($height);
                $width          = PHPExcel_Calculation_Functions::flattenSingleValue($width);
                if ($cellAddress == Null) {
                        return 0;
                }

                $args = func_get_args();
                $pCell = array_pop($args);
                if (!is_object($pCell)) {
                        return PHPExcel_Calculation_Functions::REF();
                }

                $sheetName = NULL;
                if (strpos($cellAddress,"!")) {
                        list($sheetName,$cellAddress) = explode("!",$cellAddress);
                        $sheetName = trim($sheetName, "'");
                }
                if (strpos($cellAddress,":")) {
                        list($startCell,$endCell) = explode(":",$cellAddress);
                } else {
                        $startCell = $endCell = $cellAddress;
                }
                list($startCellColumn,$startCellRow) = PHPExcel_Cell::coordinateFromString($startCell);
                list($endCellColumn,$endCellRow) = PHPExcel_Cell::coordinateFromString($endCell);

                $startCellRow += $rows;
                $startCellColumn = PHPExcel_Cell::columnIndexFromString($startCellColumn) - 1;
                $startCellColumn += $columns;

                if (($startCellRow <= 0) || ($startCellColumn < 0)) {
                        return PHPExcel_Calculation_Functions::REF();
                }
                $endCellColumn = PHPExcel_Cell::columnIndexFromString($endCellColumn) - 1;
                if (($width != null) && (!is_object($width))) {
                        $endCellColumn = $startCellColumn + $width - 1;
                } else {
                        $endCellColumn += $columns;
                }
                $startCellColumn = PHPExcel_Cell::stringFromColumnIndex($startCellColumn);

                if (($height != null) && (!is_object($height))) {
                        $endCellRow = $startCellRow + $height - 1;
                } else {
                        $endCellRow += $rows;
                }

                if (($endCellRow <= 0) || ($endCellColumn < 0)) {
                        return PHPExcel_Calculation_Functions::REF();
                }
                $endCellColumn = PHPExcel_Cell::stringFromColumnIndex($endCellColumn);

                $cellAddress = $startCellColumn.$startCellRow;
                if (($startCellColumn != $endCellColumn) || ($startCellRow != $endCellRow)) {
                        $cellAddress .= ':'.$endCellColumn.$endCellRow;
                }

                if ($sheetName !== NULL) {
                        $pSheet = $pCell->getParent()->getParent()->getSheetByName($sheetName);
                } else {
                        $pSheet = $pCell->getParent();
                }

                return PHPExcel_Calculation::getInstance()->extractCellRange($cellAddress, $pSheet, False);
        }       //      function OFFSET()


        /**
         * CHOOSE
         *
         * Uses lookup_value to return a value from the list of value arguments.
         * Use CHOOSE to select one of up to 254 values based on the lookup_value.
         *
         * Excel Function:
         *              =CHOOSE(index_num, value1, [value2], ...)
         *
         * @param       index_num               Specifies which value argument is selected.
         *                                                      Index_num must be a number between 1 and 254, or a formula or reference to a cell containing a number
         *                                                              between 1 and 254.
         * @param       value1...               Value1 is required, subsequent values are optional.
         *                                                      Between 1 to 254 value arguments from which CHOOSE selects a value or an action to perform based on
         *                                                              index_num. The arguments can be numbers, cell references, defined names, formulas, functions, or
         *                                                              text.
         * @return      mixed                   The selected value
         */
        public static function CHOOSE() {
                $chooseArgs = func_get_args();
                $chosenEntry = PHPExcel_Calculation_Functions::flattenArray(array_shift($chooseArgs));
                $entryCount = count($chooseArgs) - 1;

                if(is_array($chosenEntry)) {
                        $chosenEntry = array_shift($chosenEntry);
                }
                if ((is_numeric($chosenEntry)) && (!is_bool($chosenEntry))) {
                        --$chosenEntry;
                } else {
                        return PHPExcel_Calculation_Functions::VALUE();
                }
                $chosenEntry = floor($chosenEntry);
                if (($chosenEntry <= 0) || ($chosenEntry > $entryCount)) {
                        return PHPExcel_Calculation_Functions::VALUE();
                }

                if (is_array($chooseArgs[$chosenEntry])) {
                        return PHPExcel_Calculation_Functions::flattenArray($chooseArgs[$chosenEntry]);
                } else {
                        return $chooseArgs[$chosenEntry];
                }
        }       //      function CHOOSE()


        /**
         * MATCH
         *
         * The MATCH function searches for a specified item in a range of cells
         *
         * Excel Function:
         *              =MATCH(lookup_value, lookup_array, [match_type])
         *
         * @param       lookup_value    The value that you want to match in lookup_array
         * @param       lookup_array    The range of cells being searched
         * @param       match_type              The number -1, 0, or 1. -1 means above, 0 means exact match, 1 means below. If match_type is 1 or -1, the list has to be ordered.
         * @return      integer                 The relative position of the found item
         */
        public static function MATCH($lookup_value, $lookup_array, $match_type=1) {
                $lookup_array = PHPExcel_Calculation_Functions::flattenArray($lookup_array);
                $lookup_value = PHPExcel_Calculation_Functions::flattenSingleValue($lookup_value);
                $match_type     = (is_null($match_type)) ? 1 : (int) PHPExcel_Calculation_Functions::flattenSingleValue($match_type);
                //      MATCH is not case sensitive
                $lookup_value = strtolower($lookup_value);

                //      lookup_value type has to be number, text, or logical values
                if ((!is_numeric($lookup_value)) && (!is_string($lookup_value)) && (!is_bool($lookup_value))) {
                        return PHPExcel_Calculation_Functions::NA();
                }

                //      match_type is 0, 1 or -1
                if (($match_type !== 0) && ($match_type !== -1) && ($match_type !== 1)) {
                        return PHPExcel_Calculation_Functions::NA();
                }

                //      lookup_array should not be empty
                $lookupArraySize = count($lookup_array);
                if ($lookupArraySize <= 0) {
                        return PHPExcel_Calculation_Functions::NA();
                }

                //      lookup_array should contain only number, text, or logical values, or empty (null) cells
                foreach($lookup_array as $i => $lookupArrayValue) {
                        //      check the type of the value
                        if ((!is_numeric($lookupArrayValue)) && (!is_string($lookupArrayValue)) &&
                                (!is_bool($lookupArrayValue)) && (!is_null($lookupArrayValue))) {
                                return PHPExcel_Calculation_Functions::NA();
                        }
                        //      convert strings to lowercase for case-insensitive testing
                        if (is_string($lookupArrayValue)) {
                                $lookup_array[$i] = strtolower($lookupArrayValue);
                        }
                        if ((is_null($lookupArrayValue)) && (($match_type == 1) || ($match_type == -1))) {
                                $lookup_array = array_slice($lookup_array,0,$i-1);
                        }
                }

                // if match_type is 1 or -1, the list has to be ordered
                if ($match_type == 1) {
                        asort($lookup_array);
                        $keySet = array_keys($lookup_array);
                } elseif($match_type == -1) {
                        arsort($lookup_array);
                        $keySet = array_keys($lookup_array);
                }

                // **
                // find the match
                // **
                // loop on the cells
//              var_dump($lookup_array);
//              echo '<br />';
                foreach($lookup_array as $i => $lookupArrayValue) {
                        if (($match_type == 0) && ($lookupArrayValue == $lookup_value)) {
                                //      exact match
                                return ++$i;
                        } elseif (($match_type == -1) && ($lookupArrayValue <= $lookup_value)) {
//                              echo '$i = '.$i.' => ';
//                              var_dump($lookupArrayValue);
//                              echo '<br />';
//                              echo 'Keyset = ';
//                              var_dump($keySet);
//                              echo '<br />';
                                $i = array_search($i,$keySet);
//                              echo '$i='.$i.'<br />';
                                // if match_type is -1 <=> find the smallest value that is greater than or equal to lookup_value
                                if ($i < 1){
                                        // 1st cell was allready smaller than the lookup_value
                                        break;
                                } else {
                                        // the previous cell was the match
                                        return $keySet[$i-1]+1;
                                }
                        } elseif (($match_type == 1) && ($lookupArrayValue >= $lookup_value)) {
//                              echo '$i = '.$i.' => ';
//                              var_dump($lookupArrayValue);
//                              echo '<br />';
//                              echo 'Keyset = ';
//                              var_dump($keySet);
//                              echo '<br />';
                                $i = array_search($i,$keySet);
//                              echo '$i='.$i.'<br />';
                                // if match_type is 1 <=> find the largest value that is less than or equal to lookup_value
                                if ($i < 1){
                                        // 1st cell was allready bigger than the lookup_value
                                        break;
                                } else {
                                        // the previous cell was the match
                                        return $keySet[$i-1]+1;
                                }
                        }
                }

                //      unsuccessful in finding a match, return #N/A error value
                return PHPExcel_Calculation_Functions::NA();
        }       //      function MATCH()


        /**
         * INDEX
         *
         * Uses an index to choose a value from a reference or array
         *
         * Excel Function:
         *              =INDEX(range_array, row_num, [column_num])
         *
         * @param       range_array             A range of cells or an array constant
         * @param       row_num                 The row in array from which to return a value. If row_num is omitted, column_num is required.
         * @param       column_num              The column in array from which to return a value. If column_num is omitted, row_num is required.
         * @return      mixed                   the value of a specified cell or array of cells
         */
        public static function INDEX($arrayValues,$rowNum = 0,$columnNum = 0) {

                if (($rowNum < 0) || ($columnNum < 0)) {
                        return PHPExcel_Calculation_Functions::VALUE();
                }

                if (!is_array($arrayValues)) {
                        return PHPExcel_Calculation_Functions::REF();
                }

                $rowKeys = array_keys($arrayValues);
                $columnKeys = @array_keys($arrayValues[$rowKeys[0]]);

                if ($columnNum > count($columnKeys)) {
                        return PHPExcel_Calculation_Functions::VALUE();
                } elseif ($columnNum == 0) {
                        if ($rowNum == 0) {
                                return $arrayValues;
                        }
                        $rowNum = $rowKeys[--$rowNum];
                        $returnArray = array();
                        foreach($arrayValues as $arrayColumn) {
                                if (is_array($arrayColumn)) {
                                        if (isset($arrayColumn[$rowNum])) {
                                                $returnArray[] = $arrayColumn[$rowNum];
                                        } else {
                                                return $arrayValues[$rowNum];
                                        }
                                } else {
                                        return $arrayValues[$rowNum];
                                }
                        }
                        return $returnArray;
                }
                $columnNum = $columnKeys[--$columnNum];
                if ($rowNum > count($rowKeys)) {
                        return PHPExcel_Calculation_Functions::VALUE();
                } elseif ($rowNum == 0) {
                        return $arrayValues[$columnNum];
                }
                $rowNum = $rowKeys[--$rowNum];

                return $arrayValues[$rowNum][$columnNum];
        }       //      function INDEX()


        /**
         * TRANSPOSE
         *
         * @param       array   $matrixData     A matrix of values
         * @return      array
         *
         * Unlike the Excel TRANSPOSE function, which will only work on a single row or column, this function will transpose a full matrix.
         */
        public static function TRANSPOSE($matrixData) {
                $returnMatrix = array();
                if (!is_array($matrixData)) { $matrixData = array(array($matrixData)); }

                $column = 0;
                foreach($matrixData as $matrixRow) {
                        $row = 0;
                        foreach($matrixRow as $matrixCell) {
                                $returnMatrix[$row][$column] = $matrixCell;
                                ++$row;
                        }
                        ++$column;
                }
                return $returnMatrix;
        }       //      function TRANSPOSE()


        private static function _vlookupSort($a,$b) {
                $f = array_keys($a);
                $firstColumn = array_shift($f);
                if (strtolower($a[$firstColumn]) == strtolower($b[$firstColumn])) {
                        return 0;
                }
                return (strtolower($a[$firstColumn]) < strtolower($b[$firstColumn])) ? -1 : 1;
        }       //      function _vlookupSort()


        /**
        * VLOOKUP
        * The VLOOKUP function searches for value in the left-most column of lookup_array and returns the value in the same row based on the index_number.
        * @param        lookup_value    The value that you want to match in lookup_array
        * @param        lookup_array    The range of cells being searched
        * @param        index_number    The column number in table_array from which the matching value must be returned. The first column is 1.
        * @param        not_exact_match Determines if you are looking for an exact match based on lookup_value.
        * @return       mixed                   The value of the found cell
        */
        public static function VLOOKUP($lookup_value, $lookup_array, $index_number, $not_exact_match=true) {
                $lookup_value   = PHPExcel_Calculation_Functions::flattenSingleValue($lookup_value);
                $index_number   = PHPExcel_Calculation_Functions::flattenSingleValue($index_number);
                $not_exact_match        = PHPExcel_Calculation_Functions::flattenSingleValue($not_exact_match);

                // index_number must be greater than or equal to 1
                if ($index_number < 1) {
                        return PHPExcel_Calculation_Functions::VALUE();
                }

                // index_number must be less than or equal to the number of columns in lookup_array
                if ((!is_array($lookup_array)) || (empty($lookup_array))) {
                        return PHPExcel_Calculation_Functions::REF();
                } else {
                        $f = array_keys($lookup_array);
                        $firstRow = array_pop($f);
                        if ((!is_array($lookup_array[$firstRow])) || ($index_number > count($lookup_array[$firstRow]))) {
                                return PHPExcel_Calculation_Functions::REF();
                        } else {
                                $columnKeys = array_keys($lookup_array[$firstRow]);
                                $returnColumn = $columnKeys[--$index_number];
                                $firstColumn = array_shift($columnKeys);
                        }
                }

                if (!$not_exact_match) {
                        uasort($lookup_array,array('self','_vlookupSort'));
                }

                $rowNumber = $rowValue = False;
                foreach($lookup_array as $rowKey => $rowData) {
                        if (strtolower($rowData[$firstColumn]) > strtolower($lookup_value)) {
                                break;
                        }
                        $rowNumber = $rowKey;
                        $rowValue = $rowData[$firstColumn];
                }

                if ($rowNumber !== false) {
                        if ((!$not_exact_match) && ($rowValue != $lookup_value)) {
                                //      if an exact match is required, we have what we need to return an appropriate response
                                return PHPExcel_Calculation_Functions::NA();
                        } else {
                                //      otherwise return the appropriate value
                                return $lookup_array[$rowNumber][$returnColumn];
                        }
                }

                return PHPExcel_Calculation_Functions::NA();
        }       //      function VLOOKUP()


        /**
         * LOOKUP
         * The LOOKUP function searches for value either from a one-row or one-column range or from an array.
         * @param       lookup_value    The value that you want to match in lookup_array
         * @param       lookup_vector   The range of cells being searched
         * @param       result_vector   The column from which the matching value must be returned
         * @return      mixed                   The value of the found cell
         */
        public static function LOOKUP($lookup_value, $lookup_vector, $result_vector=null) {
                $lookup_value   = PHPExcel_Calculation_Functions::flattenSingleValue($lookup_value);

                if (!is_array($lookup_vector)) {
                        return PHPExcel_Calculation_Functions::NA();
                }
                $lookupRows = count($lookup_vector);
                $l = array_keys($lookup_vector);
                $l = array_shift($l);
                $lookupColumns = count($lookup_vector[$l]);
                if ((($lookupRows == 1) && ($lookupColumns > 1)) || (($lookupRows == 2) && ($lookupColumns != 2))) {
                        $lookup_vector = self::TRANSPOSE($lookup_vector);
                        $lookupRows = count($lookup_vector);
                        $l = array_keys($lookup_vector);
                        $lookupColumns = count($lookup_vector[array_shift($l)]);
                }

                if (is_null($result_vector)) {
                        $result_vector = $lookup_vector;
                }
                $resultRows = count($result_vector);
                $l = array_keys($result_vector);
                $l = array_shift($l);
                $resultColumns = count($result_vector[$l]);
                if ((($resultRows == 1) && ($resultColumns > 1)) || (($resultRows == 2) && ($resultColumns != 2))) {
                        $result_vector = self::TRANSPOSE($result_vector);
                        $resultRows = count($result_vector);
                        $r = array_keys($result_vector);
                        $resultColumns = count($result_vector[array_shift($r)]);
                }

                if ($lookupRows == 2) {
                        $result_vector = array_pop($lookup_vector);
                        $lookup_vector = array_shift($lookup_vector);
                }
                if ($lookupColumns != 2) {
                        foreach($lookup_vector as &$value) {
                                if (is_array($value)) {
                                        $k = array_keys($value);
                                        $key1 = $key2 = array_shift($k);
                                        $key2++;
                                        $dataValue1 = $value[$key1];
                                } else {
                                        $key1 = 0;
                                        $key2 = 1;
                                        $dataValue1 = $value;
                                }
                                $dataValue2 = array_shift($result_vector);
                                if (is_array($dataValue2)) {
                                        $dataValue2 = array_shift($dataValue2);
                                }
                                $value = array($key1 => $dataValue1, $key2 => $dataValue2);
                        }
                        unset($value);
                }

                return self::VLOOKUP($lookup_value,$lookup_vector,2);
        }       //      function LOOKUP()

}       //      class PHPExcel_Calculation_LookupRef