src/Bundle/Common/File/FileUpload.php
public function errorMessage(): string
    {
        static $errors = array(
            UPLOAD_ERR_INI_SIZE => 'The file "%s" exceeds your upload_max_filesize ini directive (limit is %d KiB).',
            UPLOAD_ERR_FORM_SIZE => 'The file "%s" exceeds the upload limit defined in your form.',
            UPLOAD_ERR_PARTIAL => 'The file "%s" was only partially uploaded.',
            UPLOAD_ERR_NO_FILE => 'No file was uploaded.',
            UPLOAD_ERR_CANT_WRITE => 'The file "%s" could not be written on disk.',
            UPLOAD_ERR_NO_TMP_DIR => 'File could not be uploaded: missing temporary directory.',
            UPLOAD_ERR_EXTENSION => 'File upload was stopped by a PHP extension.',
        );

        $errorCode = $this->error;
        $maxFileSize = $errorCode === UPLOAD_ERR_INI_SIZE ? $this->getMaxFileSize() / 1024 : 0;
        $message = isset($errors[$errorCode]) ? $errors[$errorCode] : 'The file "%s" was not uploaded due to an unknown error.';

        return sprintf($message, $this->name, $maxFileSize);
    }
public function errorMessage(): string
    {
        static $errors = array(
            UPLOAD_ERR_INI_SIZE => 'The file "%s" exceeds your upload_max_filesize ini directive (limit is %d KiB).',
            UPLOAD_ERR_FORM_SIZE => 'The file "%s" exceeds the upload limit defined in your form.',
            UPLOAD_ERR_PARTIAL => 'The file "%s" was only partially uploaded.',
            UPLOAD_ERR_NO_FILE => 'No file was uploaded.',
            UPLOAD_ERR_CANT_WRITE => 'The file "%s" could not be written on disk.',
            UPLOAD_ERR_NO_TMP_DIR => 'File could not be uploaded: missing temporary directory.',
            UPLOAD_ERR_EXTENSION => 'File upload was stopped by a PHP extension.',
        );

        $errorCode = $this->error;
        $maxFileSize = $errorCode === UPLOAD_ERR_INI_SIZE ? $this->getMaxFileSize() / 1024 : 0;
        $message = isset($errors[$errorCode]) ? $errors[$errorCode] : 'The file "%s" was not uploaded due to an unknown error.';

        return sprintf($message, $this->name, $maxFileSize);
    }
Returns an informative upload error message.

@return string The error message regarding the specified error code