(PHP 4 >= 4.3.0, PHP 5)
odbc_data_source — Returns information about a current connection
$connection_id
   , int $fetch_type
   )This function will return the list of available DSN (after calling it several times).
connection_idThe ODBC connection identifier, see odbc_connect() for details.
fetch_type
       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.
      
   Returns FALSE on error, and an array upon success.