Description
array 
odbc_data_source ( resource connection_id, int fetch_type )
     Returns FALSE on error, and an array upon success.
    
     This function will return the list of available DNS (after calling it
     several times).  The
     connection_id is required to be a valid ODBC
     connection.  The fetch_type can be one of two
     constant types: SQL_FETCH_FIRST, SQL_FETCH_NEXT.  Use SQL_FETCH_FIRST the
     first time this function is called, thereafter use the SQL_FETCH_NEXT.