EDI\Reader::preValidate PHP Method

    public function preValidate()
    {
        $this->errors = [];
        if (!is_array($this->parsedfile)) {
            $this->errors[] = 'Incorrect format parsed file';
            return false;
        }
        $r = $this->readUNHmessageNumber();
        if (!$r && isset($this->errors[0]) && $this->errors[0] == 'Segment "UNH" is ambiguous') {
            $this->errors = [];
            $this->errors[] = 'File has multiple messages';
            return false;
        }
        return true;
    }