Yii2实现UploadedFile上传文件示例

框架(架构)  /  管理员 发布于 7年前   174

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

/**   * Returns an uploaded file for the given model attribute.   * The file should be uploaded using [[\yii\widgets\ActiveField::fileInput()]].   * @param \yii\base\Model $model the data model   * @param string $attribute the attribute name. The attribute name may contain array indexes.   * For example, '[1]file' for tabular file uploading; and 'file[1]' for an element in a file array.   * @return UploadedFile the instance of the uploaded file.   * Null is returned if no file is uploaded for the specified model attribute.   * @see getInstanceByName()   */  public static function getInstance($model, $attribute)  {    $name = Html::getInputName($model, $attribute);    return static::getInstanceByName($name);  }  /**   * Returns all uploaded files for the given model attribute.   * @param \yii\base\Model $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)  {    $name = Html::getInputName($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;  }

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

/**   * 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['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

/**   * 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, $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{  /**   * @var string the original name of the file being uploaded   */  // "Chrysanthemum.jpg"  public $name;  /**   * @var string the path of the uploaded file on the server.   * Note, this is a temporary file which will be automatically deleted by PHP   * after the current request is processed.   */  // "C:\Windows\Temp\php8CEF.tmp"  public $tempName;  /**   * @var string the MIME-type of the uploaded file (such as "image/gif").   * Since this MIME type is not checked on the server-side, do not take this value for granted.   * Instead, use [[\yii\helpers\FileHelper::getMimeType()]] to determine the exact MIME type.   */  // "image/jpeg"  public $type;  /**   * @var integer the actual size of the uploaded file in bytes   */  // 879394  public $size;  /**   * @var integer an error code describing the status of this file uploading.   * @see http://www.php.net/manual/en/features.file-upload.errors.php   */  // 0  public $error;  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 [[\yii\widgets\ActiveField::fileInput()]].   * @param \yii\base\Model $model the data model   * @param string $attribute the attribute name. The attribute name may contain array indexes.   * For example, '[1]file' for tabular file uploading; and 'file[1]' for an element in a file array.   * @return UploadedFile the instance of the uploaded file.   * Null is returned if no file is uploaded for the specified model attribute.   * @see getInstanceByName()   */  public static function getInstance($model, $attribute)  {    $name = Html::getInputName($model, $attribute);    return static::getInstanceByName($name);  }  /**   * Returns all uploaded files for the given model attribute.   * @param \yii\base\Model $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)  {    $name = Html::getInputName($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 $name the name of the file input field.   * @return null|UploadedFile the instance of the uploaded file.   * Null is returned if no file is uploaded for the specified name.   */  public static function getInstanceByName($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]', '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[$name])) {      return [new static($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['name'], $info['tmp_name'], $info['type'], $info['size'], $info['error']);        }      }    }    return self::$_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, $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,      ];    }  }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

您可能感兴趣的文章:

• Yii中使用PHPExcel导出Excel的方法
• Yii2框架中使用PHPExcel导出Excel文件的示例
• Yii框架使用PHPExcel导出Excel文件的方法分析【改进版】
• Yii Framework框架使用PHPExcel组件的方法示例
• YII2框架中excel表格导出的方法详解
• Yii安装与使用Excel扩展的方法
• Yii框架扩展CGridView增加导出CSV功能的方法
• Yii2使用自带的UploadedFile实现的文件上传
• Yii配置文件用法详解
• Yii2中YiiBase自动加载类、引用文件方法分析(autoload)
• YII中Ueditor富文本编辑器文件和图片上传的配置图文教程
• Yii框架中使用PHPExcel的方法分析