Detailed explanation of the operation excel class implemented by php

<&#63;php
class Excel
{
  static $instance=null;
  private $excel=null;
  private $workbook=null;
  private $workbookadd=null;
  private $worksheet=null;
  private $worksheetadd=null;
  private $sheetnum=1;
  private $cells=array();
  private $fields=array();
  private $maxrows;
  private $maxcols;
  private $filename;
  //构造函数
  private function Excel()
  {
    $this->excel = new COM("Excel.Application") or die("Did Not Connect");
  }
  //类入口
  public static function getInstance()
  {
    if(null == self::$instance)
    {
      self::$instance = new Excel();
    }
    return self::$instance;
  }
  //设置文件地址
  public function setFile($filename)
  {
    return $this->filename=$filename;
  }
  //打开文件
  public function Open()
  {
    $this->workbook=$this->excel->WorkBooks->Open($this->filename);
  }
  //设置Sheet
  public function setSheet($num=1)
  {
    if($num>0)
    {
      $this->sheetnum=$num;
      $this->worksheet=$this->excel->WorkSheets[$this->sheetnum];
      $this->maxcols=$this->maxCols();
      $this->maxrows=$this->maxRows();
      $this->getCells();
    }
  }
  //取得表所有值并写进数组
  private function getCells()
  {
    for($i=1;$i<$this->maxcols;$i++)
    {
      for($j=2;$j<$this->maxrows;$j++)
      {
        $this->cells[$this->worksheet->Cells(1,$i)->value][]=(string)$this->worksheet->Cells($j,$i)->value;
      }
    }
    return $this->cells;
  }
  //返回表格内容数组
  public function getAllData()
  {
    return $this->cells;
  }
  //返回制定单元格内容
  public function Cell($row,$col)
  {
    return $this->worksheet->Cells($row,$col)->Value;
  }
  //取得表格字段名数组
  public function getFields()
  {
    for($i=1;$i<$this->maxcols;$i++)
    {
      $this->fields[]=$this->worksheet->Cells(1,$i)->value;
    }
    return $this->fields;
  }
  //修改制定单元格内容
  public function editCell($row,$col,$value)
  {
    if($this->workbook==null || $this->worksheet==null)
    {
      echo "Error:Did Not Connect!";
    }else{
      $this->worksheet->Cells($row,$col)->Value=$value;
      $this->workbook->Save();
    }
  }
  //修改一行数据
  public function editOneRow($row,$arr)
  {
    if($this->workbook==null || $this->worksheet==null || $row>=2)
    {
      echo "Error:Did Not Connect!";
    }else{
      if(count($arr)==$this->maxcols-1)
      {
        $i=1;
        foreach($arr as $val)
        {
          $this->worksheet->Cells($row,$i)->Value=$val;
          $i++;
        }
        $this->workbook->Save();
      }
    }
  }
  //取得总列数
  private function maxCols()
  {
    $i=1;
    while(true)
    {
      if(0==$this->worksheet->Cells(1,$i))
      {
        return $i;
        break;
      }
      $i++;
    }
  }
  //取得总行数
  private function maxRows()
  {
    $i=1;
    while(true)
    {
      if(0==$this->worksheet->Cells($i,1))
      {
        return $i;
        break;
      }
      $i++;
    }
  }
  //读取制定行数据
  public function getOneRow($row=2)
  {
    if($row>=2)
    {
      for($i=1;$i<$this->maxcols;$i++)
      {
        $arr[]=$this->worksheet->Cells($row,$i)->Value;
      }
      return $arr;
    }
  }
  //关闭对象
  public function Close()
  {
    $this->excel->WorkBooks->Close();
    $this->excel=null;
    $this->workbook=null;
    $this->worksheet=null;
    self::$instance=null;
  }
};
/*
$excel = new COM("Excel.Application");
$workbook = $excel->WorkBooks->Open('D://Apache2//htdocs//wwwroot//MyExcel.xls');
$worksheet = $excel->WorkSheets(1);
echo $worksheet->Cells(2,6)->Value;
$excel->WorkBooks->Close();
*/
$excel=Excel::getInstance();
$excel->setFile("D://kaka.xls");
$excel->Open();
$excel->setSheet();
for($i=1;$i<16;$i++ )
{
  $arr[]=$i;
}
//$excel->editOneRow(2,$arr);
//print_r($excel->getAllData());
    $str=$excel->getAllData();
    include_once('mail.class.php');
    $smtpserver="smtp.yeah.net";
   $smtpserverport=25;
   $smtpuseremail="yanqihu58@yeah.net";
   $smtpemailto="yanqihu@139.com";
   $smtpuser="yanqihu58";
   $smtppwd="123456789";
    $mailtype="HTML";
    $smtp=new smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppwd);
    $message="你好";
   //$message.="首页连接地址为：".$this->link_url."<br>";
   //$message.="电子邮箱为：".$this->link_email."<br>";
   //$message.="商务联系QQ：".$this->link_qq."<br>";
   //$message.="商务电话QQ：".$this->link_tel."<br>";
   //$message.="联系人：".$this->link_people."<br>";
    $smtp->debug=false;
    foreach($str['email'] as $key=>$value){
      $smtpemailto=$value;
      @$smtp->sendmail($smtpemailto,$smtpuseremail,$mailsubject,$message,$mailtype);
      exit;
    }
    //exit;
$excel->Close();
?>