session_set_save_handler and error handling

[Werner Elflein]

Let open, close, read, write, destroy and gc be PHP functions to save
the superglobal array $_SESSION in a database.

I would like to use the following code:

[1] session_set_sav e_handler(open, close,read,writ e,gc);
[2] session_start() ;
[3] if(!isset($_SES SION))
[4] {
/* error handling */
exit;
}
/* session okay */

But what will happen, if (e.g.) the database is down?
Means: What kind of error handling can or must be implemented within the
functions open, close, read, write, destroy and gc to get a stable
script? Of course, line [3] is not enough ...

[petersprc]

Re: session_set_sav e_handler and error handling

You can trigger a fatal error with trigger_error(' Message',
E_USER_ERROR) or throw an exception. If your read function fails, that
should return false.

On Jul 13, 4:29 pm, Werner Elflein <em...@wernerel flein.dewrote:

Let open, close, read, write, destroy and gc be PHP functions to save
the superglobal array $_SESSION in a database.
>
I would like to use the following code:
>
[1] session_set_sav e_handler(open, close,read,writ e,gc);
[2] session_start() ;
[3] if(!isset($_SES SION))
[4] {
/* error handling */
exit;
}
/* session okay */
>
But what will happen, if (e.g.) the database is down?
Means: What kind of error handling can or must be implemented within the
functions open, close, read, write, destroy and gc to get a stable
script? Of course, line [3] is not enough ...