Description:
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From manual page: http://www.php.net/function.sybase-connect
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We need an additional parameter for the sybase_connect function: Databasename

Like this:

resource sybase_connect ([ string $servername [, string $username [, string $password [, string $charset [, string $appname [, bool $new = false ][, string $Databasename ]]]]]])

If you have specified a default databasename "database1" at the sybase-server and the database has the following users: "user1", "user2" but you have also a database "database2" with "user3" and "user4", you have no chance to connect to "database2" with "user3".

Following errors appear:
sybase_connect(): Sybase:  Unable to connect in ...
sybase_select_db(): supplied argument is not a valid Sybase-Link resource in ...

Because of some backup/restore behavior we have to define a default database! It would be a nice feature to add the "databasename" to the sybase_connect:-)