PHP alternative to mysql_data_seek for ODBC

I am converting a PHP-mySQL application to a PHP-ODBC application. ie getting the database migrated from mysql to DB2.

1. While using mysql i used mysql_data_seek function so as to reset the recordset pointer, but this does not work for ODBC connection. I tried and checked odbc_fetch_row($recordset,0) for resetting the recordset, but this does not work. Does anyone know how to reset the recordset via ODBC connection?
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2. odbc_num_rows function does not work properly for ODBC. Does not really give the correct result always. It provides -1 many times.
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3. SQL_CUR_USE_ODBC is not supported by the ODBC-DB2 driver hence functions like odbc_ fetch_ row