Constants normally define paths and database information. These values are global and cannot be changed when they are first defined. This is why constants are used for such vital information.

These constants are defined at various points during the bootstrap sequence.


To make the table below a bit more compact, namespaces were left out. Here are the fully qualified class names referred to below:

Table 1: Traditional List

Constant Defined in Description Avail. in FE
TYPO3_MODE \TYPO3\CMS\Backend\Console\Application::defineLegacyConstants() \TYPO3\CMS\Backend\Http\Application::defineLegacyConstants() \TYPO3\CMS\Core\Console\CommandApplication::defineLegacyConstants() \TYPO3\CMS\Frontend\Http\Application::defineLegacyConstants() \TYPO3\CMS\Install\Http\Application::defineLegacyConstants() Mode of TYPO3: Set to either "FE" or "BE" depending on frontend or backend execution and context.


value = "FE"

TYPO3_OS SystemEnvironmentBuilder::defineBaseConstants() Operating systen; Windows = "WIN", other = "" (presumed to be some sort of Unix) Yes
PATH_thisScript SystemEnvironmentBuilder::definePaths() Abs. path to current script. Yes
TYPO3_mainDir SystemEnvironmentBuilder::definePaths() This is the directory of the backend administration for the sites of this TYPO3 installation. Hardcoded to typo3/. Must be a subdirectory to the website. See elsewhere for descriptions on how to change the default admin directory, typo3/, to something else. Yes
PATH_typo3 SystemEnvironmentBuilder::definePaths() Abs. path of the TYPO3 admin dir (PATH_site + TYPO3_mainDir). No
PATH_site SystemEnvironmentBuilder::definePaths() Absolute path to directory with the frontend (one directory above PATH_typo3) Yes
PATH_typo3conf SystemEnvironmentBuilder::definePaths() Absolute TYPO3 configuration path (local, not part of source). Yes
TYPO3_DLOG Bootstrap::defineLoggingAndExceptionConstants() If true, calls to \TYPO3\CMS\Core\Utility\GeneralUtility::devLog() can be made in both frontend and backend; This is event logging which can help to track debugging in general. Yes
TYPO3_version SystemEnvironmentBuilder::defineBaseConstants() The TYPO3 version, as a "x.y.z" number. Development versions will be either "x.y.z-dev" for stable versions or "x.y-dev" for the current master. Yes
TYPO3_branch SystemEnvironmentBuilder::defineBaseConstants() The TYPO3 version Branch, as a "x.y" number. Without the patch level. Yes

Table 2: Base Constants

Check \TYPO3\CMS\Core\Core\SystemEnvironmentBuilder::defineBaseConstants() for updates.

String constants

Constant Value Description
NUL chr(0) A null
TAB chr(9) A tabulator
LF chr(10) A linefeed
CR chr(13) A carriage return
SUB chr(26) A sub (substitute) character
CRLF CR + LF Carriage return + linefeed pair

Operating system identifier

Constant Value Description
TYPO3_OS self::getTypo3Os()) Either "WIN" or empty string

Service error constants

Constant Value Description
T3_ERR_SV_GENERAL -1 General error - something went wrong
T3_ERR_SV_NOT_AVAIL -2 During execution it showed that the service is not available and should be ignored. The service itself should call $this->setNonAvailable()
T3_ERR_SV_WRONG_SUBTYPE -3 Passed subtype is not possible with this service
T3_ERR_SV_NO_INPUT -4 Passed subtype is not possible with this service
T3_ERR_SV_FILE_NOT_FOUND -20 File not found which the service should process
T3_ERR_SV_FILE_READ -21 File not readable
T3_ERR_SV_FILE_WRITE -22 File not writable
T3_ERR_SV_PROG_NOT_FOUND -40 Passed subtype is not possible with this service
T3_ERR_SV_PROG_FAILED -41 Passed subtype is not possible with this service