DefaultValueBinder.php

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<?php
if (!defined('PHPEXCEL_ROOT')) {
        define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
        require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}


class PHPExcel_Cell_DefaultValueBinder implements PHPExcel_Cell_IValueBinder
{
        public function bindValue(PHPExcel_Cell $cell, $value = null)
        {
                // sanitize UTF-8 strings
                if (is_string($value)) {
                        $value = PHPExcel_Shared_String::SanitizeUTF8($value);
                }

                // Set value explicit
                $cell->setValueExplicit( $value, PHPExcel_Cell_DataType::dataTypeForValue($value) );

                // Done!
                return true;
        }

        public static function dataTypeForValue($pValue = null) {
                // Match the value against a few data types
                if (is_null($pValue)) {
                        return PHPExcel_Cell_DataType::TYPE_NULL;

                } elseif ($pValue === '') {
                        return PHPExcel_Cell_DataType::TYPE_STRING;

                } elseif ($pValue instanceof PHPExcel_RichText) {
                        return PHPExcel_Cell_DataType::TYPE_STRING;

                } elseif ($pValue{0} === '=' && strlen($pValue) > 1) {
                        return PHPExcel_Cell_DataType::TYPE_FORMULA;

                } elseif (is_bool($pValue)) {
                        return PHPExcel_Cell_DataType::TYPE_BOOL;

                } elseif (is_float($pValue) || is_int($pValue)) {
                        return PHPExcel_Cell_DataType::TYPE_NUMERIC;

                } elseif (preg_match('/^\-?([0-9]+\\.?[0-9]*|[0-9]*\\.?[0-9]+)$/', $pValue)) {
                        return PHPExcel_Cell_DataType::TYPE_NUMERIC;

                } elseif (is_string($pValue) && array_key_exists($pValue, PHPExcel_Cell_DataType::getErrorCodes())) {
                        return PHPExcel_Cell_DataType::TYPE_ERROR;

                } else {
                        return PHPExcel_Cell_DataType::TYPE_STRING;

                }
        }
}