Thanks for your prompt reply.
Here is the information:
PHP Version: 5.6.17-0+deb8u1.
FILEINFO_MIME_TYPE is defined.
finfo_open is callable.
finfo_file is callable.
finfo_close is callable.
mime_content_type is callable.
This is a NON-Windows OS: Linux.
escapeshellarg is callable.
exec is callable.
shell_exec is callable.
Alto55