See ISO 18004:2006, 6.4.1, Tables 2 and 3. This enum encapsulates the various modes in which * data can be encoded to bits in the QR code standard.

* * @author Sean Owen */ class Mode { public static $TERMINATOR; public static $NUMERIC; public static $ALPHANUMERIC; public static $STRUCTURED_APPEND; public static $BYTE; public static $ECI; public static $KANJI; public static $FNC1_FIRST_POSITION; public static $FNC1_SECOND_POSITION; public static $HANZI; public function __construct(private $characterCountBitsForVersions, private $bits) { } public static function Init(): void { self::$TERMINATOR = new Mode([0, 0, 0], 0x00); // Not really a mode... self::$NUMERIC = new Mode([10, 12, 14], 0x01); self::$ALPHANUMERIC = new Mode([9, 11, 13], 0x02); self::$STRUCTURED_APPEND = new Mode([0, 0, 0], 0x03); // Not supported self::$BYTE = new Mode([8, 16, 16], 0x04); self::$ECI = new Mode([0, 0, 0], 0x07); // character counts don't apply self::$KANJI = new Mode([8, 10, 12], 0x08); self::$FNC1_FIRST_POSITION = new Mode([0, 0, 0], 0x05); self::$FNC1_SECOND_POSITION = new Mode([0, 0, 0], 0x09); /** See GBT 18284-2000; "Hanzi" is a transliteration of this mode name. */ self::$HANZI = new Mode([8, 10, 12], 0x0D); } /** * @param four $bits bits encoding a QR Code data mode * * @return Mode encoded by these bits * @throws InvalidArgumentException if bits do not correspond to a known mode */ public static function forBits($bits) { return match ($bits) { 0x0 => self::$TERMINATOR, 0x1 => self::$NUMERIC, 0x2 => self::$ALPHANUMERIC, 0x3 => self::$STRUCTURED_APPEND, 0x4 => self::$BYTE, 0x5 => self::$FNC1_FIRST_POSITION, 0x7 => self::$ECI, 0x8 => self::$KANJI, 0x9 => self::$FNC1_SECOND_POSITION, 0xD => self::$HANZI, default => throw new \InvalidArgumentException(), }; } /** * @param version $version in question * * @return number of bits used, in this QR Code symbol {@link Version}, to encode the * count of characters that will follow encoded in this Mode */ public function getCharacterCountBits($version) { $number = $version->getVersionNumber(); $offset = 0; if ($number <= 9) { $offset = 0; } elseif ($number <= 26) { $offset = 1; } else { $offset = 2; } return $this->characterCountBitsForVersions[$offset]; } public function getBits() { return $this->bits; } } Mode::Init();