You are probably looking for something like `array_key_exists($varName, get_defined_vars());`: https://3v4l.org/XagEA
Marco Pivetta http://twitter.com/Ocramius http://ocramius.github.com/ On 26 August 2015 at 04:26, Sherif Ramadan <theanomaly...@gmail.com> wrote: > I get that it exists. I'm asking what is the usefulness of having a > function that tells you the variable is null? In theory this sounds great > and is actually very doable by checking the symbol table for the hash. > However, in practice, who actually has a use for this? Null is a special > value in PHP, so if you're assigning it to a variable explicitly you should > already know you've initialized that variable and can safely rely on if ($x > === null) in your code. > > I'm not confused about the differences. I'm questioning the usefulness of > such a function. > > On Tue, Aug 25, 2015 at 11:18 PM, Scott Arciszewski <sc...@paragonie.com> > wrote: > > > Because $x exists. > > > > https://3v4l.org/kUJtP > > Scott Arciszewski > > Chief Development Officer > > Paragon Initiative Enterprises > > > > > > On Tue, Aug 25, 2015 at 11:16 PM, Sherif Ramadan > > <theanomaly...@gmail.com> wrote: > > > Yes, because all undefined variables in PHP are implicitly null. As far > > as > > > PHP is concerned, if it's null, it's by definition _not defined_. Also, > > > still not seeing where a NOTICE is involved here? Those functions never > > give > > > errors. > > > > > > What is the usefulness of a function that merely returns true when a > > > variable is null? > > > > > > On Tue, Aug 25, 2015 at 11:13 PM, Scott Arciszewski < > sc...@paragonie.com > > > > > > wrote: > > >> > > >> On Tue, Aug 25, 2015 at 11:11 PM, Sherif Ramadan > > >> <theanomaly...@gmail.com> wrote: > > >> > That's exactly what isset() does. isset/empty never raise errors. > > >> > > > >> > On Tue, Aug 25, 2015 at 11:09 PM, Scott Arciszewski > > >> > <sc...@paragonie.com> > > >> > wrote: > > >> >> > > >> >> Hi everybody, > > >> >> > > >> >> Would anyone be interested in adding another helper like > > >> >> isset()/empty() simply called exists() which would return true if > the > > >> >> variable is defined in the current scope (i.e. without raising an > > >> >> E_NOTICE)? > > >> >> > > >> >> It should be a simple change to add this function but it's too late > > >> >> for 7.0 so, if there is any interest, I would respectfully put it > off > > >> >> until 7.1. > > >> >> > > >> >> Scott Arciszewski > > >> >> Chief Development Officer > > >> >> Paragon Initiative Enterprises <https://paragonie.com> > > >> >> > > >> >> -- > > >> >> PHP Internals - PHP Runtime Development Mailing List > > >> >> To unsubscribe, visit: http://www.php.net/unsub.php > > >> >> > > >> > > > >> http://phpsadness.com/sad/28 > > >> https://3v4l.org/2vrKG > > >> > > >> Not quite. > > >> > > >> Scott Arciszewski > > >> Chief Development Officer > > >> Paragon Initiative Enterprises <https://paragonie.com> > > > > > > > > >
