Re: Re: if (empty versus if (isset

> Jim Giner <jim.giner@albanyhandball.com> hat am 20. Februar 2013 um 15:10 > geschrieben: > > > Basically it tells a savvy programmer whether or not his logic has > caused the var in question to "exist". Many times it is important > simply to know that, not what the var contains, which can lead to an > error in processing. > > The isset() will tell you that "yes, I have this variable", letting you > then correctly interpret the contents. If a $_POST var is not set > (meaning the user made no input to it), the use of empty() will insist > on telling you that the var is empty even tho it really was not provided > by the user (assuming that you don't get an error msg for having an > invalid index in the POST array). keep in mind that isset returns false if the variable exists, but has a value of null. The same applies to existing array keys with value null. > > They seem to be needlessly redundant, but in fact do provide knowledge > for those seeking it. No, they are not as I wrote in my last message > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > -- Marco Behnke Dipl. Informatiker (FH), SAE Audio Engineer Diploma Zend Certified Engineer PHP 5.3 Tel.: 0174 / 9722336 e-Mail: marco@behnke.biz Softwaretechnik Behnke Heinrich-Heine-Str. 7D 21218 Seevetal http://www.behnke.biz