php 输出EXCEL文件

<?php
require_once( FCPATH.'vendor/Excel/excel/PHPExcel/IOFactory.php');

function readexcel( $filePath) { 
$PHPReader = new PHPExcel_Reader_Excel5();
         if(!$PHPReader->canRead($filePath)){   
             $PHPReader = new PHPExcel_Reader_Excel5();   
                   if(!$PHPReader->canRead($filePath)){         
                        echo 'no Excel';  
                         return ;   
                   }  
          }

$PHPExcel = $PHPReader->load($filePath);  

$currentSheet = $PHPExcel->getSheet(0);  /**取得一共有多少列*/

$allColumn = $currentSheet->getHighestColumn();     /**取得一共有多少行*/ 

$allRow = $currentSheet->getHighestRow();

$all = array();
for( $currentRow = 1 ; $currentRow <= $allRow ; $currentRow++){

          $flag = 0;
          $col = array();
          for($currentColumn='A'; getascii($currentColumn) <= getascii($allColumn) ; $currentColumn++){

                $address = $currentColumn.$currentRow;   

                $string = $currentSheet->getCell($address)->getValue();

                $col[$flag] = $string;

                $flag++;
          } 

      $all[] = $col;
}

return $all;
}

function getascii( $ch) {
  if( strlen( $ch) == 1)
    return ord( $ch)-65;
  return ord($ch[1])-38;
}
//该片段来自于http://outofmemory.cn