适用于初学者的简易PHP文件上传类

protected $_uploaded = array();
protected $_destination;
protected $_max = 1024000;
protected $_messages = array();
protected $_permited = array(
'image/gif','image/jpeg','image/pjpeg','image/png'
);
protected $_renamed = false;

/**

• @param mix $path

• */
  public function __construct($path){

if (!is_dir($path) || !is_writable($path)){
  throw new Exception("文件名不可写，或者不是目录！");
}
$this->_destination = $path;
$this->_uploaded = $_FILES;

}
/**

• 移动文件

• */
  public function move(){

$filed = current($this->_uploaded); 

$isOk = $this->checkError($filed['name'],$filed['error']);
//debug ok
if ($isOk){
  $sizeOk = $this->checkSize($filed['name'],$filed['size']);
  $typeOk = $this->checkType($filed['name'],$filed['type']);
  if ($sizeOk && $typeOk){

    $success = move_uploaded_file($filed['tmp_name'],$this->_destination.$filed['name']);

    if ($success){
      $this->_messages[] = $filed['name']."文件上传成功";
    }else {
      $this->_messages[] = $filed['name']."文件上传失败";
    }
  }

}

}
/**

• 查询messages数组内容

• */
  public function getMessages(){
  return $this->_messages;
  }

/**

• 检测上传的文件大小
• @param mix $string
• @param int $size
  */
  public function checkSize($filename,$size){

if ($size == 0){
  return false;
}else if ($size > $this->_max){
  $this->_messages[] = "文件超出上传限制大小".$this->getMaxsize();
  return false;
}else { 
  return true;
}

}

/**

• 检测上传文件的类型
• @param mix $filename
• @param mix $type
  */
  protected function checkType($filename,$type){
  if (!in_array($type,$this->_permited)){
  $this->_messages[] = "该文件类型是不被允许的上传类型";
  return false;
  }else {
  return true;
  }
  }

/**

• 获取文件大小

• */
  public function getMaxsize(){
  return number_format($this->_max / 1024,1).'KB';
  }

/**

• 检测上传错误
• @param mix $filename
• @param int $error

• */
  public function checkError($filename,$error){
  switch ($error){
  case 0 : return true;
  case 1 :
  case 2 : $this->_messages[] = "文件过大！"; return true;
  case 3 : $this->_messages[] = "错误上传文件！";return false;
  case 4 : $this->_messages[] = "没有选择文件!"; return false;
  default : $this->_messages[] = "系统错误!"; return false;
  }
  }
  }
  ?>