[pmwiki-users] Is there a way to disable a cookbook in some Group and how ?

[ABClf]

Ah, that is true I have some work to do before I get the most basic
elements of php ;)
Thank you for the explanation and the validation, Peter !


2010/1/29 Peter Bowers <pbowers at pobox.com>:
> On Fri, Jan 29, 2010 at 7:51 AM, ABClf <languefrancaise at gmail.com> wrote:
>> if ($group != 'Private' && $action == 'edit') {
>> include_once("$FarmD/cookbook/authorcontrib.php"); }
>
> This (above) is correct.
>
>> if (!$group == 'P' && $action == 'edit') {
>> include_once("$FarmD/cookbook/authorcontrib.php"); }
>>
>> That blocks too other group.
>> I don't see where is the trouble : doesn't the « if condition » says :
>> if not group P + if action=edit ?
>
> You have a problem with the order of processing of operators.  You are
> assuming NOT (group == P) while it is actually being processed as
> ((NOT GROUP) == P).
>
> Since all data types in PHP can be used as booleans (0 or blank or
> null or whatever is false, other values are true) what you have done
> is converted $group from a string to a boolean -- since $group always
> has a value (i.e., boolean TRUE) then putting the ! in front of it
> says "NOT $group" or boolean FALSE when $group contains something.
> Thus when you are saying (!$group == 'P') it becomes (FALSE == 'P').
>
> Anyway, that was a long explanation and maybe not so helpful.  Here's
> what you're looking for to implement the semantics you were aiming
> towards:
>
>> if (!($group == 'P' && $action == 'edit')) {
>> include_once("$FarmD/cookbook/authorcontrib.php"); }
>
> (Note the parentheses surrounding the entire inner conditional)
>
> This is kind of different than the way it's usually written, although
> I may be just expressing my own stylistic preferences.  I would tend
> to write the same thing like this:
>
>> if ($group != 'P' || $action != 'edit') {
>> include_once("$FarmD/cookbook/authorcontrib.php"); }
>
> Note the change of both == operators to != and the change of && to ||.
>
> -Peter
>



-- 
---------------------------------------
| A | de la langue française
| B | http://www.languefrancaise.net/
| C | languefrancaise at gmail.com
---------------------------------------