Implementation code for writing excel files in php

<?php
/** 
     * 将联系人导出为excel 
     * @param $filename string 导出文件名 
     * @param $titles array 标题数组 
     * @param $elements array(array()) 元素数组 
     */  
    public function exportFileContacts($filename, $titles, $elements){  
        try {  
            $objPHPExcel = new PHPExcel();  
            $objPHPExcel->setActiveSheetIndex(0); //设置活动页面  
            $activeSheet = $objPHPExcel->getActiveSheet(); //获取当前活动页面  
            $activeSheet->getDefaultColumnDimension()->setWidth(16); //设置列宽16  
            $activeSheet->setTitle("联系人"); //设置sheet的名称  
              
            //设置标题，单元格第一列为0，第一行为1  
            $colNum = count($titles);  
            for($i = 0; $i < $colNum; $i++){  
                $activeSheet->getStyleByColumnAndRow($i, 1)->getFont()->setBold(true); //设置标题加粗  
                $activeSheet->setCellValueByColumnAndRow($i, 1, $titles[$i]);  
            }  
              
            //设置 body，row从2开始，第一行已经被设置为标题了  
            $rowNum = count($elements);  
            for($row = 0; $row < $rowNum; $row++){  
    for($col = 0; $col < $colNum; $col++){  
      $activeSheet->getStyle($this->numToEn($col).($row+2))->getNumberFormat()->setFormatCode(PHPExcel_Style_NumberFormat::FORMAT_TEXT);  
      $activeSheet->setCellValue($this->numToEn($col).($row+2)," ".$elements[$row][$col]);
  //在写入Excels单元格的内容之前加一个空格，防止长数字被转化成科学计数法  
      $activeSheet->getStyle($this->numToEn($col).($row+2))->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);  
      }  
 }  
              
//获取保存文件名称  
 $filetype = $this->getFileType($filename);  
//根据文件类型读取excel文件  
ob_end_clean();  
 $objWriter = null;  
if ($filetype == "xlsx") {  
  $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');  
  header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');  
  header('Content-Disposition: attachment;filename='.urlencode($filename));  
  header('Cache-Control: max-age=0');  
 ob_end_clean();  
  $objWriter->save('php://output');  
   $objPHPExcel->disconnectWorksheets();  
    unset($objPHPExcel);  
                exit;  
            } elseif ($filetype == "xls") {  
                $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');  
                header('Content-Type: application/vnd.ms-excel');  
                header('Content-Disposition: attachment;filename='.urlencode($filename));  
                header('Cache-Control: max-age=0');  
                                ob_end_clean();  
                $objWriter->save('php://output');  
                $objPHPExcel->disconnectWorksheets();  
                unset($objPHPExcel);  
                exit;  
            } else {  
                return false;  
            }  
        } catch (Exception $e) {  
             HWS::logErr('EXCEL ERROR:'.$e->getMessage());  
             $errText = "创建错误文件失败，请联系管理员，稍后再试！";  
             return array('createFileErr'=>$errText);  
        }  
    }  
  
/** 
     * 获取文件类型 
     * @param $filenamePath 文件路径或者文件名 
     */  
    private function getFileType($filenamePath){  
        if (!$filenamePath){  
            return false;  
        }  
        $filenameArr = explode('/', $filenamePath);  
        $count = count($filenameArr);  
        $filename = $filenameArr[$count-1];  
          
        $filetypeArr = explode('.', $filename);  
        $count = count($filetypeArr);  
        $filetype = $filetypeArr[$count-1];  
        return $filetype;     
    }  
      
    /** 
    根据给定的数字生成至多两位对应EXCEL文件列的字母 
    */  
    private function numToEn($num)  
    {  
        $asc = 0;  
        $en = "";  
        $num =(int)$num+1;  
        if($num<26)                      //判断指定的数字是否需要用两个字母表示  
        {  
            if((int)$num<10)  
            {  
                $asc = ord($num);  
                $en =chr($asc+16);  
            }  
            else  
            {  
                $num_g = substr($num,1,1);  
                $num_s = substr($num,0,1);  
                $asc = ord($num_g);  
                $en =chr($asc+16+10*$num_s);  
            }  
        }  
        else  
        {  
            $num_complementation = floor($num/26);  
            $en_q = $this->numToEn($num_complementation);  
            $en_h = $num%26 != 0 ? $this->numToEn($num-$num_complementation*26):"A";  
            $en = $en_q.$en_h;  
        }  
        return $en;  
    }