Yii2实现UploadedFile上传文件示例

UploadFile::getInstances($model,$attribute);

UploadFile::getInstanceByName($name);

UploadFile::getInstancesByName($name);

/**

• Returns all uploaded files for the given model attribute.
• @param yiibaseModel $model the data model
• @param string $attribute the attribute name. The attribute name may contain array indexes
• for tabular file uploading,e.g. '[1]file'.
• @return UploadedFile[] array of UploadedFile objects.
• Empty array is returned if no available file was found for the given attribute.
  */
  public static function getInstances($model,$attribute);
  return static::getInstancesByName($name);
  }

/**

• Returns an uploaded file according to the given file input name.
• The name can be a plain string or a string like an array element (e.g. 'Post[imageFile]',or 'Post[0][imageFile]').
• @param string $name the name of the file input field.
• @return UploadedFile the instance of the uploaded file.
• Null is returned if no file is uploaded for the specified name.
  */
  public static function getInstanceByName($name)
  {
  $files = self::loadFiles();
  return isset($files[$name]) ? $files[$name] : null;
  }

/**

• Returns an array of uploaded files corresponding to the specified file input name.
• This is mainly used when multiple files were uploaded and saved as 'files[0]','files[1]',* 'files[n]'...,and you can retrieve them all by passing 'files' as the name.
• @param string $name the name of the array of files
• @return UploadedFile[] the array of UploadedFile objects. Empty array is returned
• if no adequate upload was found. Please note that this array will contain
• all files from all sub-arrays regardless how deeply nested they are.
  */
  public static function getInstancesByName($name)
  {
  $files = self::loadFiles();
  if (isset($files[$name])) {
  return [$files[$name]];
  }
  $results = [];
  foreach ($files as $key => $file) {
  if (strpos($key,"{$name}[") === 0) {
  $results[] = $file;
  }
  }
  return $results;
  }

$info) { self::loadFilesRecursive($class,$info['name'],$info['tmp_name'],$info['type'],$info['size'],$info['error']); } } } return self::$_files; }

$name) { self::loadFilesRecursive($key . '[' . $i . ']',$name,$tempNames[$i],$types[$i],$sizes[$i],$errors[$i]); } } elseif ($errors !== UPLOAD_ERR_NO_FILE) { self::$_files[$key] = new static([ 'name' => $names,'tempName' => $tempNames,'type' => $types,'size' => $sizes,'error' => $errors,]); } }

$patch = $path . '/' . date("YmdHis") . '_'; $tmp = UploadedFile::getInstanceByName('head_pic'); if ($tmp) { $patch = $path . '/' . date("YmdHis") . '_'; $tmp->saveAs($patch . '1.jpg'); $returnPath .= $patch; } return $returnPath;

}

private static $_files;

/**

• String output.
• This is PHP magic method that returns string representation of an object.
• The implementation here returns the uploaded file's name.
• @return string the string representation of the object
  */
  public function __toString()
  {
  return $this->name;
  }

/**

• Returns an uploaded file for the given model attribute.
• The file should be uploaded using [[yiiwidgetsActiveField::fileInput()]].
• @param yiibaseModel $model the data model
• @param string $attribute the attribute name. The attribute name may contain array indexes.
• For example,or 'Post[0][imageFile]').
• @param string $name the name of the file input field.
• @return null|UploadedFile the instance of the uploaded file.
• Null is returned if no file is uploaded for the specified name.
  */
  public static function getInstanceByName($name)
  {
  $files = self::loadFiles();
  return isset($files[$name]) ? new static($files[$name]) : null;
  }

/**

• Returns an array of uploaded files corresponding to the specified file input name.
• This is mainly used when multiple files were uploaded and saved as 'files[0]',and you can retrieve them all by passing 'files' as the name.
• @param string $name the name of the array of files
• @return UploadedFile[] the array of UploadedFile objects. Empty array is returned
• if no adequate upload was found. Please note that this array will contain
• all files from all sub-arrays regardless how deeply nested they are.
  */
  public static function getInstancesByName($name)
  {
  $files = self::loadFiles();
  if (isset($files[$name])) {
  return [new static($files[$name])];
  }
  $results = [];
  foreach ($files as $key => $file) {
  if (strpos($key,"{$name}[") === 0) {
  $results[] = new static($file);
  }
  }
  return $results;
  }

/**

• Cleans up the loaded UploadedFile instances.
• This method is mainly used by test scripts to set up a fixture.
  */
  //清空self::$_files
  public static function reset()
  {
  self::$_files = null;
  }

/**

• Saves the uploaded file.
• Note that this method uses php's move_uploaded_file() method. If the target file $file
• already exists,it will be overwritten.
• @param string $file the file path used to save the uploaded file
• @param boolean $deleteTempFile whether to delete the temporary file after saving.
• If true,you will not be able to save the uploaded file again in the current request.
• @return boolean true whether the file is saved successfully
• @see error
  */
  //通过php的move_uploaded_file() 方法保存临时文件为目标文件
  public function saveAs($file,$deleteTempFile = true)
  {
  //$this->error == UPLOAD_ERR_OK UPLOAD_ERR_OK 其值为 0，没有错误发生，文件上传成功。
  if ($this->error == UPLOAD_ERR_OK) {
  if ($deleteTempFile) {
  //将上传的文件移动到新位置
  return move_uploaded_file($this->tempName,$file);
  } elseif (is_uploaded_file($this->tempName)) {//判断文件是否是通过 HTTP POST 上传的
  return copy($this->tempName,$file);//copy — 拷贝文件
  }
  }
  return false;
  }

/**

• @return string original file base name
  */
  //获取上传文件原始名称 "name" => "Chrysanthemum.jpg" "Chrysanthemum"
  public function getBaseName()
  {
  // https://github.com/yiisoft/yii2/issues/11012
  $pathInfo = pathinfo('_' . $this->name,PATHINFO_FILENAME);
  return mb_substr($pathInfo,1,mb_strlen($pathInfo,'8bit'),'8bit');
  }

/**

• @return string file extension
  */
  //获取上传文件扩展名称 "name" => "Chrysanthemum.jpg" "jpg"
  public function getExtension()
  {
  return strtolower(pathinfo($this->name,PATHINFO_EXTENSION));
  }

/**

• @return boolean whether there is an error with the uploaded file.
• Check [[error]] for detailed error code information.
  */
  //上传文件是否出现错误
  public function getHasError()
  {
  return $this->error != UPLOAD_ERR_OK;
  }

/**

• Creates UploadedFile instances from $_FILE.
• @return array the UploadedFile instances
  */
  private static function loadFiles()
  {
  if (self::$_files === null) {
  self::$_files = [];
  if (isset($_FILES) && is_array($_FILES)) {
  foreach ($_FILES as $class => $info) {
  self::loadFilesRecursive($class,$info['error']);
  }
  }
  }
  return self::$_files;
  }

/**

• Creates UploadedFile instances from $_FILE recursively.
• @param string $key key for identifying uploaded file: class name and sub-array indexes
• @param mixed $names file names provided by PHP
• @param mixed $tempNames temporary file names provided by PHP
• @param mixed $types file types provided by PHP
• @param mixed $sizes file sizes provided by PHP
• @param mixed $errors uploading issues provided by PHP
  */
  private static function loadFilesRecursive($key,$errors[$i]);
  }
  } elseif ((int)$errors !== UPLOAD_ERR_NO_FILE) {
  self::$_files[$key] = [
  'name' => $names,];
  }
  }
  }