Re: reason for a "Notice:.." on one site but not another? (Same code.)
| From: | Andrew Ballard | Date: | Mon, 10 Aug 2009 18:29:43 +0000 |
| Subject: | Re: reason for a "Notice:.." on one site but not another? (Same code.) | ||
| References: | 1 2 3 4 5 6 7 8 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-296561@lists.php.net to get a copy of this message | ||
On Mon, Aug 10, 2009 at 1:50 PM, Ralph Deffke<ralph_deffke@yahoo.de> wrote:
> this is not "intelligence" its just pure math. the '&&' says if
> BOTH
> expressions are true then the whole expression is true.
>
> so if the first one is false, the whole is false, why checking the next one
> in the underlaying C it would be something like this
> {
> if ( expression == false ) return false;
> if ( expression == false) return false;
> return true;
> }
>
> ralph
> ralph_deffke@yahoo.de
That's logically correct, and while PHP does implement this
"short-circuit" logic, not all languages do. In that regard, I
appreciate what John meant by saying it makes it look "more
intelligent." Some languages evaluate each of the conditions to their
respective boolean results before evaluating the logical operators.
Andrew