RE: [PHP] isset

> how I understand: > clause one: isset($_GET['var']) > clause two: ($_GET['var'] == 'foo') > if clause two is true, clause one MUST be true. > if clause one is true, clause two could be true or false. > > means, if I look for solutions where ($_GET['var'] == 'foo') they wil > lautomaticaly cover isset($_GET['var']) part. > if ($_GET['var'] != 'foo') I erally do not care > isset($_GET['var']) or > !isset($_GET['var']). If you are looking for isset($_GET['var']) to return true if the value exists, but may be null, you can always use if (isset($_GET['var']) || is_null($_GET['var])) Albeit, I'm unsure if this will generate a warning if $_GET['var'] doesn't exist for the is_null() call. And in this case, I believe it would be appropriate to ignore that one warning. -Logan -----Original Message----- From: Larry Garfield [mailto:larry@garfieldtech.com] Sent: Sunday, April 15, 2007 1:17 PM To: php-general@lists.php.net Subject: Re: [PHP] isset On Sunday 15 April 2007 12:07 pm, afan@afan.net wrote: > > of course it's your call whether you write/run code that spits out > > E_NOTICEs all over the place due to usage of uninitialized vars. > > not quite sure. if $_GET['var'] doesn't exists it's DEFINITLY not equal to > 'foo', right? > > > or I'm missing something here? > > I have E_NOTICE turned off. :) And right there is your first mistake. The only time to not have E_NOTICE on is when you're using legacy code that isn't E_NOTICE compliant and you don't have the time to upgrade it to be compliant. Developing without E_NOTICE means you're telling the computer "it's OK, let me just randomly guess where this bug or security hole or random typo is". *Bad* idea. *Always* develop in the tightest, most restricted, most nit-picky setting you can get, regardless of the language. If you want your syntax to be a bit simpler, I frequently use helper functions along these lines: function http_get_int($var, $default=0) { return isset($_GET[$var]) ? (int) $_GET[$var] : $default; } if (http_get_int('var') ==5) { // Do stuff } Clean to read, easy defaults, (reasonably) type-safe, and E_NOTICE friendly. -- Larry Garfield AIM: LOLG42 larry@garfieldtech.com ICQ: 6817012 "If nature has made any one thing less susceptible than all others of exclusive property, it is the action of the thinking power called an idea, which an individual may exclusively possess as long as he keeps it to himself; but the moment it is divulged, it forces itself into the possession of every one, and the receiver cannot dispossess himself of it." -- Thomas Jefferson -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php