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 [[yiiwidgetsActiveField::fileInput()]]. * @param yiiaseModel $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 yiiaseModel $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" => $errors, ]); } }实例:
html
<form class="form-horizontal form-margin50" action="<?= yiihelpersUrl::toRoute("upload-face") ?>" method="post" enctype="multipart/form-data" id="form1"> <input type="hidden" name="_csrf" value="<?= Yii::$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:WindowsTempphp8CEF.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 [[yiihelpersFileHelper::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 [[yiiwidgetsActiveField::fileInput()]]. * @param yiiaseModel $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 yiiaseModel $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网页设计。
