`TCA`

The folder EXT:my_extension/Configuration/TCA/ may contain or override TCA (TYPO3 configuration array) data.

All files in this directory are automatically included during the TYPO3 bootstrap.

New in version 12.0

Files within Configuration/TCA/ files are loaded within a dedicated scope. This means that variables defined in those files cannot leak to any other TCA file during the TCA compilation process.

Note

In TYPO3 v11 and below, variables declared in these files were in a shared scope, with the risk of a leakage to the following files. The use of call_user_func() wrap was a common workaround.

`<tablename>.php`

One file per database table, using the name of the table for the file, plus ".php". Only for new tables.

`Overrides`

For extending existing tables.

General advice: One file per database table, using the name of the table for the file, plus .php. For more information, see the chapter Extending the TCA array.