Jyxo\Input\Validator\Upload::isValid PHP Method

    public function isValid($file) : bool
    {
        $valid = false;
        if (!$file instanceof \Jyxo\Input\Upload) {
            $file = new \Jyxo\Input\Upload($file);
        }
        if ($file->tmpName() && $this->isUploaded($file->tmpName())) {
            $valid = true;
        } else {
            $postMaxSize = ini_get('post_max_size');
            $mul = substr($postMaxSize, -1);
            $mul = $mul == 'M' ? 1048576 : ($mul == 'K' ? 1024 : ($mul == 'G' ? 1073741824 : 1));
            if (isset($_SERVER['CONTENT_LENGTH'])) {
                if ($_SERVER['CONTENT_LENGTH'] > $mul * (int) $postMaxSize && $postMaxSize) {
                    $this->error = _('The file you are trying to upload is too big.');
                } else {
                    $this->setError($file->error());
                }
            } elseif ($this->requireUpload) {
                $this->error = _('No file was uploaded.');
            } else {
                $this->failedEmpty = true;
            }
        }
        return $valid;
    }