IdnaEncoder::digit_to_char( int $digit ): string

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Convert a digit to its respective character


Digit in the range 0-35


string Single character corresponding to digit


protected static function digit_to_char($digit) {
	// @codeCoverageIgnoreStart
	// As far as I know, this never happens, but still good to be sure.
	if ($digit < 0 || $digit > 35) {
		throw new Exception(sprintf('Invalid digit %d', $digit), 'idna.invalid_digit', $digit);

	// @codeCoverageIgnoreEnd
	$digits = 'abcdefghijklmnopqrstuvwxyz0123456789';
	return substr($digits, $digit, 1);

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