SAP RFC Can't find interface name IT_ZZTABLE

Hi,

I have created a connection to call a web service from php using saprfc connector.

But whenever I try to call FM (i.e. using web service) I am getting following error.

Warning: CALDBG: Can't find interface name IT_ZZTABLE, __cal_set().

Please find below my code:

"Local Interface:
*"  IMPORTING
*"     VALUE(IT_ZZTABLE) TYPE  TT_ZZTABLE //It is of table type.
*"  EXCEPTIONS
*"      ERROR_OCCURRED

$_InputParams = array(array("IT_ZZTABLE", array("PARAM1"=>$PARAM1,"PARAM2"=>$PARAM2,"PARAM3"=>$PARAM3));

    {

     }

Any help is appreciated.

Thanks,

Vikrant.