クラス yii\web\MultipartFormDataParser

                public function getUploadFileMaxCount()
{
    if ($this->_uploadFileMaxCount === null) {
        $this->_uploadFileMaxCount = (int)ini_get('max_file_uploads');
    }
    return $this->_uploadFileMaxCount;
}

            

                public function getUploadFileMaxSize()
{
    if ($this->_uploadFileMaxSize === null) {
        $this->_uploadFileMaxSize = $this->getByteSize(ini_get('upload_max_filesize'));
    }
    return $this->_uploadFileMaxSize;
}

            

                public function parse($rawBody, $contentType)
{
    if (!$this->force) {
        if (!empty($_POST) || !empty($_FILES)) {
            // normal POST request is parsed by PHP automatically
            return $_POST;
        }
    } else {
        $_FILES = [];
    }
    if (empty($rawBody)) {
        return [];
    }
    if (!preg_match('/boundary="?(.*)"?$/is', $contentType, $matches)) {
        return [];
    }
    $boundary = trim($matches[1], '"');
    $bodyParts = preg_split('/\\R?-+' . preg_quote($boundary, '/') . '/s', $rawBody);
    array_pop($bodyParts); // last block always has no data, contains boundary ending like `--`
    $bodyParams = [];
    $filesCount = 0;
    foreach ($bodyParts as $bodyPart) {
        if (empty($bodyPart)) {
            continue;
        }
        list($headers, $value) = preg_split('/\\R\\R/', $bodyPart, 2);
        $headers = $this->parseHeaders($headers);
        if (!isset($headers['content-disposition']['name'])) {
            continue;
        }
        if (isset($headers['content-disposition']['filename'])) {
            // file upload:
            if ($filesCount >= $this->getUploadFileMaxCount()) {
                continue;
            }
            $fileInfo = [
                'name' => $headers['content-disposition']['filename'],
                'type' => ArrayHelper::getValue($headers, 'content-type', 'application/octet-stream'),
                'size' => StringHelper::byteLength($value),
                'error' => UPLOAD_ERR_OK,
                'tmp_name' => null,
            ];
            if ($fileInfo['size'] > $this->getUploadFileMaxSize()) {
                $fileInfo['error'] = UPLOAD_ERR_INI_SIZE;
            } else {
                $tmpResource = tmpfile();
                if ($tmpResource === false) {
                    $fileInfo['error'] = UPLOAD_ERR_CANT_WRITE;
                } else {
                    $tmpResourceMetaData = stream_get_meta_data($tmpResource);
                    $tmpFileName = $tmpResourceMetaData['uri'];
                    if (empty($tmpFileName)) {
                        $fileInfo['error'] = UPLOAD_ERR_CANT_WRITE;
                        @fclose($tmpResource);
                    } else {
                        fwrite($tmpResource, $value);
                        rewind($tmpResource);
                        $fileInfo['tmp_name'] = $tmpFileName;
                        $fileInfo['tmp_resource'] = $tmpResource; // save file resource, otherwise it will be deleted
                    }
                }
            }
            $this->addFile($_FILES, $headers['content-disposition']['name'], $fileInfo);
            $filesCount++;
        } else {
            // regular parameter:
            $this->addValue($bodyParams, $headers['content-disposition']['name'], $value);
        }
    }
    return $bodyParams;
}

            

                public function setUploadFileMaxCount($uploadFileMaxCount)
{
    $this->_uploadFileMaxCount = $uploadFileMaxCount;
}

            

                public function setUploadFileMaxSize($uploadFileMaxSize)
{
    $this->_uploadFileMaxSize = $uploadFileMaxSize;
}