Here are some functions needing documentation related to the SybaseCT extension. It looks like Timm Friebe added these back in August and he put up some documentation here:  http://sitten-polizei.de/php/README.SYBASE.EN

Here's a quick summary:

void sybase_deadlock_retry_count(int retry_count)
Sets deadlock retry count, same as the php.ini setting.

array sybase_fetch_assoc(resource result)
Fetch a row from result set indexed by column names only

bool sybase_set_message_handler(mixed error_func)
Set the error handler, to be called when a server message is raised.  If error_func is NULL the handler will be deleted.

int sybase_unbuffered_query(string query [, int link_id])
Send Sybase query and do not block.