PHP如何读取excel文件内容？

require_once '/libs/PHPExcel-1.8.0/Classes/PHPExcel.php';     //修改为自己的目录
echo '<p>TEST PHPExcel 1.8.0: read xlsx file</p>';
$objReader = PHPExcel_IOFactory::createReaderForFile($filename);
$objPHPExcel = $objReader->load($filename);
$objPHPExcel->setActiveSheetIndex(1);
$date = $objPHPExcel->getActiveSheet()->getCell('A16')->getValue();

echo date("Y-m-d H:i:s",PHPExcel_Shared_Date::ExcelToPHP($date));

<table id="table_id">
<?php
     $objWorksheet = $objPHPExcel->getActiveSheet();
     $i = 0;
     foreach($objWorksheet->getRowIterator() as $row){
     ?>
          <tr>
          <?php
               $cellIterator = $row->getCellIterator();
               $cellIterator->setIterateOnlyExistingCells(false);

                    if( $i == 0 ){
                         echo '<thead>';
                    }
               foreach($cellIterator as $cell){

                    echo '<td>' . $cell->getValue() . '</td>';

               }
                    if( $i == 0 ){
                         echo '</thead>';
                    }
               $i++;
          ?>
          </tr>
     <?php
     }
?>
</table>