note 33009 added to language.operators.logical

[Note: the last post has an error. Use this post.] shadedecho's post to force evaluation of both OR expression is actually exactly what should be done to suppress short-circuit optimization. There are many occasions that you don't want the compiler to short-circuit any evaluation, especially when you want to do an and/or situation. The short-circuit evaluation does an OR operation but not an AND/OR operation!!! For instance, if I want the check the user's query form to see if the user has missed answering any entry AND/OR if the user had duplicated the same answer for more than one entry, then I need to send the form back to the client informing what I want to be corrected. function SomeAnswersAreMissing() { ... echo "Oops! You missed answering some questions."; return TRUE; } function SomeAnswersAreDuplicated() { ... echo "Oops! You can answer both the same way."; return TRUE; } if (SomeAnswersAreMissing() || SomeAnswersAreDuplicated()) SendFormAgain(); If I do that, the user will only see the missing answer warning but not the duplicated answer warning, even if both are true. This is not informative to the user because he/she will have to re-submit the form twice before he/she realized everything he/she did wrong, and frustrate the hack out of them. That is not user-friendly. But if I use: if (SomeAnswersAreMissing() | SomeAnswersAreDuplicated()) SendFormAgain(); Then both warning messages are sent at the same time, and the user can correct it in one re-send. Thank shadedecho, I had been looking for a way to override the compiler's stupid short-circuit optimization. The computer cannot just assume that short-circuiting is the best :( BTW, of course you can do: $you_made_a_mistake = false; if (SomeAnswersAreMissing()) { $you_made_a_mistake = true; if (SomeAnswersAreDuplicated()) $you_made_a_mistake = true; } if ($you_made_a_mistake) SendFormAgain(); But that is convoluted logic!!! ---- Manual Page -- http://www.php.net/manual/en/language.operators.logical.php Edit Note -- http://master.php.net/manage/user-notes.php?action=edit+33009 Delete Note -- http://master.php.net/manage/user-notes.php?action=delete+33009&report=yes Reject Note -- http://master.php.net/manage/user-notes.php?action=reject+33009&report=yes