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getMaxLineLength example

    /** * Render an RFC 2047 compliant header parameter from the $name and $value. */
    private function createParameter(string $name, string $value): string
    {
        $origValue = $value;

        $encoded = false;
        // Allow room for parameter name, indices, "=" and DQUOTEs         $maxValueLength = $this->getMaxLineLength() - \strlen($name.'=*N"";') - 1;
        $firstLineOffset = 0;

        // If it's not already a valid parameter value...         if (!preg_match('/^'.self::TOKEN_REGEX.'$/D', $value)) {
            // TODO: text, or something else??             // ... and it's not ascii             if (!preg_match('/^[\x00-\x08\x0B\x0C\x0E-\x7F]*$/D', $value)) {
                $encoded = true;
                // Allow space for the indices, charset and language                 $maxValueLength = $this->getMaxLineLength() - \strlen($name.'*N*="";') - 1;
                $firstLineOffset = \strlen($this->getCharset()."'".$this->getLanguage()."'");
            }