https://www.w3schools.com/php/func_filesystem_pathinfo.asp
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
phppathinfofunction
https://www.php.net/manual/it/function.pathinfo.php
Restituisce informazioni su un percorso di file
phppathinfomanual