Attention

TYPO3 v8 has reached its end-of-life March 31st, 2020 and is not maintained by the community anymore.

You can order Extended Long Term Support (ELTS) here: TYPO3 ELTS.

Extending the $TCA array

Being a PHP array, the Table Configuration Array can be easily extended. It can be accessed as the global variable $GLOBALS['TCA']. TYPO3 also provides APIs for making this simpler.