Yii2实现UploadedFile上传文件示例

闲来无事，整理了一下自己写的文件上传类。

通过

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

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

UploadFile::getInstanceByName($name);

UploadFile::getInstancesByName($name);

把表单上传的文件赋值到  UploadedFile中的  private static $_files  中

  public static function getInstance($model, $attribute)
  {
    $name = Html::getInputName($model, $attribute);
    return static::getInstanceByName($name);
  }

  
  public static function getInstances($model, $attribute)
  {
    $name = Html::getInputName($model, $attribute);
    return static::getInstancesByName($name);
  }

  
  public static function getInstanceByName($name)
  {
    $files = self::loadFiles();
    return isset($files[$name]) ? $files[$name] : null;
  }

  
  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;
  }

loadFiles()方法，把$_FILES中的键值作为参数传递到loadFilesRecursive（$key, $names, $tempNames, $types, $sizes, $errors） 中

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

loadFilesRecursive方法，通过递归把$_FILES中的内容保存到  self::$_files 中

  private static function loadFilesRecursive($key, $names, $tempNames, $types, $sizes, $errors)
  {
    if (is_array($names)) {
      foreach ($names as $i => $name) {
 self::loadFilesRecursive($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,
      ]);
    }
  }

实例:

html

php代码,打印的

public static function uploadImage($userId = '', $tem = '')
  {
    $returnPath = '';
    $path = 'uploads/headpic/' . $userId;
    if (!file_exists($path)) {
      mkdir($path, 0777);
      chmod($path, 0777);
    }

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

    return $returnPath;
  }

打印dump($tmp,$_FILES,$tmp->getExtension());

对应的 UploadedFile

class UploadedFile extends Object
{
  
  // "Chrysanthemum.jpg"
  public $name;
  
  // "C:WindowsTempphp8CEF.tmp"
  public $tempName;
  
  // "image/jpeg"
  public $type;
  
  // 879394
  public $size;
  
  // 0
  public $error;

  private static $_files;


  
  public function __toString()
  {
    return $this->name;
  }

  
  public static function getInstance($model, $attribute)
  {
    $name = Html::getInputName($model, $attribute);
    return static::getInstanceByName($name);
  }

  
  public static function getInstances($model, $attribute)
  {
    $name = Html::getInputName($model, $attribute);
    return static::getInstancesByName($name);
  }

  
  public static function getInstanceByName($name)
  {
    $files = self::loadFiles();
    return isset($files[$name]) ? new static($files[$name]) : null;
  }

  
  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;
  }

  
  //清空self::$_files
  public static function reset()
  {
    self::$_files = null;
  }

  
  //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;
  }

  
  //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');
  }

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

  
  //上传文件是否出现错误
  public function getHasError()
  {
    return $this->error != UPLOAD_ERR_OK;
  }

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

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

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