Re: variable_exists() patch

"Walt Boring" <waboring@3gstech.com> a écrit dans le message de news:3F3BDC4A.20603@3gstech.com... > Stefan Walk wrote: > > >On Thu, Aug 14, 2003 at 11:15:51AM -0700, walt boring wrote: > > > > > >>I for one would like to see something like variable_exists(), as I am > >>very annoyed with > >>the logic of isset() returning false if the variable exists and has a > >>value of null. > >> > >> > >[snip] > > > > > >> I for one would much rather do > >> if ( variable_exists($var) ) {} versus > >>if (isset($var) || is_null($var)) {} > >> > >> > > > >When do you need to do that? I can't think of many situations where it > >would be neccessary to check if a variable really exists. > > > > > It can happen quite easily. I always develop with full warnings/errors on. > So if for example a var isn't set for whatever reason, then trying to > access the > variable will throw a php Notice. variable_exists() would prevent that, > as does isset(). > isset() would work for my example below, but it still is a 'broken' > function in my opinion. > > if ($var) { // <-- you'll get a php notice on this line > switch ($var) { > ... > } > > } > > versus doing > > if (variable_exists($var)) { //no php notices here > switch($var) { > ... > } > } You can avoid the notice by doing if(isset($var) && !is_null($var)) { } We can't have a function for every piece of code. >