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);
        } elseif (is_object($value)) {
            // Handle any objects that might be injected
            if ($value instanceof DateTime) {
                $value = $value->format('Y-m-d H:i:s');
            } elseif (!($value instanceof PHPExcel_RichText)) {
                $value = (string) $value;
            }
        }

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

        // Done!
        return true;
    }

    public static function dataTypeForValue($pValue = null) {
        // Match the value against a few data types
        if ($pValue === null) {
            return PHPExcel_Cell_DataType::TYPE_NULL;
        } elseif ($pValue === '') {
            return PHPExcel_Cell_DataType::TYPE_STRING;
        } elseif ($pValue instanceof PHPExcel_RichText) {
            return PHPExcel_Cell_DataType::TYPE_INLINE;
        } 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($pValue)) {
            return PHPExcel_Cell_DataType::TYPE_NUMERIC;
        } elseif (preg_match('/^[\+\-]?([0-9]+\\.?[0-9]*|[0-9]*\\.?[0-9]+)([Ee][\-\+]?[0-2]?\d{1,3})?$/', $pValue)) {
            $tValue = ltrim($pValue, '+-');
            if (is_string($pValue) && $tValue{0} === '0' && strlen($tValue) > 1 && $tValue{1} !== '.' ) {
                return PHPExcel_Cell_DataType::TYPE_STRING;
            } elseif((strpos($pValue, '.') === false) && ($pValue > PHP_INT_MAX)) {
                return PHPExcel_Cell_DataType::TYPE_STRING;
            }
            return PHPExcel_Cell_DataType::TYPE_NUMERIC;
        } elseif (is_string($pValue) && array_key_exists($pValue, PHPExcel_Cell_DataType::getErrorCodes())) {
            return PHPExcel_Cell_DataType::TYPE_ERROR;
        }

        return PHPExcel_Cell_DataType::TYPE_STRING;
    }
}