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

/**
* 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
'..., 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

<form class="form-horizontal form-margin50" action="<?= \yii\helpers\Url::toRoute('upload-face') ?>"
method="post" enctype="multipart/form-data" id="form1">
<input type="hidden" name="_csrf" value="<?= Yii::$app->request->getCsrfToken() ?>">
<input type="file" name="head_pic" id="doc" style="display: none" onchange="setImagePreview()"/>
</form>

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
'..., 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脚本之家。

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