ifx_nullformat
    (PHP 3>= 3.0.4, PHP 4 , PHP 5)
ifx_nullformat -- 
     Sets the default return value on a fetch row
    
Description
void 
ifx_nullformat ( int mode)
     Sets the default return value of a NULL-value on a fetch row.
     Mode "0" returns "", and mode "1" returns "NULL".