How does XCache work with PHP? Do you need to use the XCache functions to be able to use your "advantages"? For example:
<?php echo xcache_inc('count'); ?>
Or, from the moment I enable the extension=php_xcache.so extension and add the settings to php.ini , would I already have such "advantages"?
Well, I believe you already know the purpose of XCache so I will not talk about the conceptual issue here.
Some facts about it: I used XCache a lot of time from that time until now it has not evolved the documentary issue, there is very little content about it. Many thought the project was dead until the last update in late 2014.
On the run: it works that way even though you said it, just install and make the settings of the respective ini file. But you can override just like it does with some php directives for some given script / application (as you did in the example).
In this post we explained in detail the most common XCache link guidelines