• 构造函数
• @param string : 服务器上存放上传文件的路径
  */
  function __construct( $path = '' )
  {
  $this->_path = $path;
  $this->_allowType = array(
  // images
  'bmp' => 'image/x-ms-bmp','jpg' => 'image/jpeg','jpeg' => 'image/jpeg','gif' => 'image/gif','png' => 'image/png','tif' => 'image/tiff','tiff' => 'image/tiff','tga' => 'image/x-targa','psd' => 'image/vnd.adobe.photoshop',//文本
  'txt' => 'text/plain','PHP' => 'text/x-PHP','html' => 'text/html','htm' => 'text/html','js' => 'text/javascript','css' => 'text/css','rtf' => 'text/rtf','rtfd' => 'text/rtfd','py' => 'text/x-python','java' => 'text/x-java-source','rb' => 'text/x-ruby','sh' => 'text/x-shellscript','pl' => 'text/x-perl','sql' => 'text/x-sql',//应用
  'exe' => 'application/octet-stream','doc' => 'application/vnd.ms-word','docx' => 'application/vnd.ms-word','xls' => 'application/vnd.ms-excel','ppt' => 'application/vnd.ms-powerpoint','pps' => 'application/vnd.ms-powerpoint','pdf' => 'application/pdf','xml' => 'application/xml',//音频
  'mp3' => 'audio/mpeg','mid' => 'audio/midi','ogg' => 'audio/ogg','mp4a' => 'audio/mp4','wav' => 'audio/wav','wma' => 'audio/x-ms-wma',//视频
  'avi' => 'video/x-msvideo','dv' => 'video/x-dv','mp4' => 'video/mp4','mpeg' => 'video/mpeg','mpg' => 'video/mpeg','mov' => 'video/quicktime','wm' => 'video/x-ms-wmv','flv' => 'video/x-flv','mkv' => 'video/x-matroska'
  );
  }
  /**
• 上传函数
• @param string : 表单元素的name 值
• @return [type]
  */
  public function upload( $txtName = '' )
  {
  $this->_file = $_FILES[$txtName];
  if( $this->_file['error'] == 0){
  $fileType = end( explode('.',$this->_file['name'] ));
  $allowType = array();
  foreach( $this->_allowType as $item=>$value ){
  $allowType[] = $item;
  }
  if( !in_array($fileType,$allowType)){
  die('上传的文件格式不正确！');
  }else{
  if(move_uploaded_file($this->file['tmp_name'],($this->path).$this->file['name']))
  {
  echo "";
  }
  else
  {
  echo "";
  }
  }

}else{
//没有正确上传
switch ($this->file['error']){
case 1:
die('文件大小超过系统限制。');
break;
case 2:
die('文件大小超过预定义限制。');
break;
case 3:
die('文件为完全上传。');
break;
case 4:
die('未上传任何文件。');
break;
default:
die('上传出错');
break;
}
}
}
//end upload
}