mixed File_Passwd_Custom::changePasswd ( 
    string $user
     , string $pass
   )
Change the password of a certain user.
$user
     the user whose password should be changed
$pass
     the new plaintext password
Returns TRUE on success, PEAR_Error on failure.
| Error Code | Summary | 
|---|---|
| FILE_PASSWD_E_EXISTS_NOT | user doesn't exist | 
| FILE_PASSWD_INVALID_ENC_MODE | actual encryption mode is not supported | 
This function can not be called statically.