ifxus_read_slob
    (PHP 3>= 3.0.4, PHP 4 , PHP 5)
ifxus_read_slob -- Reads nbytes of the slob object
Description
int 
ifxus_read_slob ( int bid, int nbytes)
     Reads nbytes of the slob object.  bid is a
     existing slob id and nbytes is the number
     of bytes read.  Return FALSE on error otherwise the string.