Unfortunately there is no direct method in PHP to get the filename from
the descriptor. But if you have (or create) an Oracle procedure you could pass it the BFILE
descriptor and get the name.
Instead of executing the query in PHP and using PL/SQL to find the filename, a more
efficient method is to create a PL/SQL anonymous block that does both the query and
extracts the filename from its returned BFILE.
The previous query code in navioo_bfilequery1.php