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' => $errors, ]); } }
实例:
html
<form action="<?= \yii\helpers\Url::toRoute('upload-face') ?>" method="post" enctype="multipart/form-data"> <input type="hidden" value="<?= Yii::$app->request->getCsrfToken() ?>"> <input type="file" 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 . 'https://www.jb51.net/' . date("YmdHis") . '_'; $tmp = UploadedFile::getInstanceByName('head_pic'); if ($tmp) { $patch = $path . 'https://www.jb51.net/' . date("YmdHis") . '_'; $tmp->saveAs($patch . '1.jpg'); $returnPath .= $patch; } return $returnPath; }
打印dump($tmp,$_FILES,$tmp->getExtension());
对应的 UploadedFile