Modify all text output by TYPO3

Question

I would like to create a "cleanup" extension that replaces various characters (quotes by guillemets) in all kinds of textfields in TYPO3.

I thought about extending <f:format.html> or parseFunc, but I don't know where to "plug in" so I get to replace output content easily before it's cached.

Any ideas, can you give me an example?

Answer 1

If you don't mind regexing, try this:

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['cleanUpQuotes'][] = \NAMESPACE\Your\Extension::class;

Insert it into ext_localconf.php and this part is done. The next step is the class itself:

public function cleanUpQuotes(TypoScriptFrontendController $parentObject)
{
   $parentObject->content = DO_YOUR_THING_HERE        
}

Answer 2

There also is another possibility which could replace any strings in the whole page - as it operates on the rendered page (and not only on single fields). You even can use regular expressions.

Look at my answer -> here