Bingo. Many thanks.

> Barley wrote:
>
> > If I run the script from a shell prompt as root, it outputs "Yes". If I
run
> > as any other user, it outputs "No." It also gives this error:
> > Warning: mysqli_connect(): Can't connect to local MySQL server through
> > socket '/var/lib/mysql/mysql.sock' (13)
>
> Check permissions on /var/lib/mysql. From the sockets manpage:
>
> NOTES
> In the Linux implementation, sockets which are visible in the filesystem
> honour the permissions of the directory they are in. Their owner, group
> and their permissions can be changed. Creation of a new socket will fail
> if the process does not have write and search (execute) permission on
> the directory the socket is created in. Connecting to the socket object
> requires read/write permission. This behavior differs from many
> BSD-derived systems which ignore permissions for Unix sockets. Portable
> programs should not rely on this feature for security.
>
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