Returns an ODBC connection id or 0 (FALSE) on error. This function is much
like odbc_connect(), except that the connection
is not really closed when the script has finished. Future
requests for a connection with the same dsn,
user, password
combination (via odbc_connect() and odbc_pconnect()) can reuse the persistent
connection.
注: Persistent connections have no effect if PHP is used as a CGI program.
For information about the optional cursor_type parameter
see the odbc_connect() function. For more
information on persistent connections, refer to the PHP
FAQ.