someone please explain weird getforeignkeys

I need to look up a table's foreign keys using the unified ODBC-functions. 'odbc_foreignkeys()' requires me to pass seven parameters, each of them being mandatory, to archive this. Because the approach is not intuitive anyhow and there is no documentation available except of the PHP-manual's prototype, neither me nor my co-workers have any idea of how to apply the function. The manual states that three of the arguments are superfluous, depending on the application; but the prototype contradicts this, declaring them mandatory. Can anyone please point me to a working code example or provide one? Thanks, D. Alvarez Arribas <alvarez@st-oneline.net> Btw, how are the inter-table relationships defined at all? I cannot think of a way to determine foreign keys without complete knowledge of all joins and subqueries potentially run against the database.