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Salve,

come prima cosa, dovremmo capire di quale libreria si tratta: FOF (F-Oh-F) oppure F0F (F-Zero-F)?

Il problema non è in sé per sé la rimozione della libreria, ma capire se qualche estensione la sta utilizzando. Entrambe sono abbastanza vecchie, per cui la probabilità è molto bassa, ma la cosa migliore sarebbe quella di installare un backup in locale e provare a disinstallarle.

mhm... no. E' la soluzione più semplice e sicura. Purtroppo Joomla ai tempi in cui è stato sviluppato FOF non aveva un sistema di gestione delle dipendenze, per cui l'unica soluzione è rimuoverla e vedere se qualcosa si rompe; ovviamente è estremamente sconsigliato farlo su un sito live.

FOF 2.4.3 is a very old version of the library which was included with Joomla! 3 itself. It has not been updated in a decade. In fact, the reason it wasn't updated in the core –despite us having released another two new major versions of it between 2015 and 2021– is that one maintainer who left the project in 2016 unilaterally decided they didn't "like" the library, and blocked us from updating it. So, Joomla 3 ended up stuck with an obsolete version of our library in it.

That ancient version most definitely does not work on Joomla 4 or 5, or any modern version of PHP. It's stuck in time.

The bigger problem for us is that Joomla! does not remove it when upgrading from Joomla! 3 to 4, even though this library has been long obsolete and cannot work in the upgraded site. As you can understand, this results in a lot of wasted time for Joomla users and us.

FOF 2.4.3 can be safely uninstalled from Joomla 4 and later sites. It cannot work on those sites. If you had an extension using it, that extension cannot run on Joomla 4 or later anyway since the library itself cannot work on those sites, meaning you'd have already removed that extension yourself, thus making it safe to remove the dead and rotting corpse of a decade-old, obsolete library.