public static function convertCellData(\PHPExcel_Cell $cell)
 {
     $ret = array();
     $datatype = $cell->getDataType();
     if ($datatype === \excel2sql\Type::EXCEL_NUMERIC) {
         $format = $cell->getStyle()->getNumberFormat()->getFormatCode();
         if (array_key_exists($format, \excel2sql\Type::$numeric_convert_map)) {
             $format = \excel2sql\Type::$numeric_convert_map[$format];
         }
         $ret['type'] = \excel2sql\Type::$numeric_to_sql_map[$format];
         $ret['value'] = \PHPExcel_Style_NumberFormat::toFormattedString($cell->getValue(), $format);
         if ($format === \excel2sql\Type::EXCEL_DATE || $format === \excel2sql\Type::EXCEL_DATETIME || $format === \excel2sql\Type::EXCEL_TIME) {
             $ret['value'] = "'{$ret['value']}'";
         }
     } else {
         $ret['type'] = \excel2sql\Type::$excel_to_sql_map[$datatype];
         if ($ret['value'] = $cell->getFormattedValue()) {
             if ($datatype === \excel2sql\Type::EXCEL_STRING || $datatype === \excel2sql\Type::EXCEL_STRING2) {
                 $ret['value'] = "\"" . preg_replace("[\"]", "''", $ret['value']) . "\"";
             }
         } else {
             $ret['value'] = "null";
         }
     }
     return $ret;
 }
 /**
  * Bind value to a cell, preserving possible leading zeros
  * See http://stackoverflow.com/questions/12457610/reading-numbers-as-text-format-with-phpexcel
  *
  * @param  PHPExcel_Cell  $cell   Cell to bind value to
  * @param  mixed          $value  Value to bind in cell
  * @return boolean
  */
 public function bindValue(PHPExcel_Cell $cell, $value = null)
 {
     // sanitize UTF-8 strings
     if (is_string($value)) {
         $value = PHPExcel_Shared_String::SanitizeUTF8($value);
     }
     // Preserve numeric string, including leading zeros, if it is a text format
     $format = $cell->getStyle()->getNumberFormat()->getFormatCode();
     if ($format == PHPExcel_Style_NumberFormat::FORMAT_TEXT) {
         $cell->setValueExplicit($value, PHPExcel_Cell_DataType::TYPE_STRING);
         return true;
     }
     // Not bound yet? Use default value parent...
     return parent::bindValue($cell, $value);
 }