(PHP 4, PHP 5)
dba_replace — Replace or insert entry
$key
   , string $value
   , resource $handle
   )
    dba_replace() replaces or inserts the entry described
   with key and value into the
   database specified by handle.
  
key
     The key of the entry to be replaced.
value
     The value to be replaced.
handle
     The database handler, returned by dba_open() or dba_popen().
   成功时返回 TRUE, 或者在失败时返回 FALSE。