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Date: Sat, 25 Aug 2012 18:38:19 +0200
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To: Sebastian Krebs <krebs.seb@gmail.com>
Cc: PHP internals list <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=047d7b2ee2e959492b04c819b874
Subject: Re: [PHP-DEV] Combined assignment operator for short ternary
From: tyra3l@gmail.com (Ferenc Kovacs)

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>
>
>> would this trigger a notice if $foo is not defined?
>> if yes, then it would be different from the current behavior of the
>> ternary operator.
>>
>
> Couldn't believe it, thus I tested it myself
>

snip


> Don't know, what you are talking about, but the notice _is_ the current
> behaiour and therefore: No difference.


Sorry, I messed up that email. What I wanted to say:
If it accepts unset variable, then I could see usecases for it, but then it
would behave differently than the current ternary.
If it doesn't accept unset variable then it would in line with what we
have, but I don't see any usecase for it, because I would have to set it
before checking that it is falsely or not, in which case I would set it to
the default if not set already.


>
>  if no, then I would never use this.
>> I mean if I have to set the variable before the check, then I would put
>> the check into the assignment.
>>
>
> The main thought about it was
>
> function foo ($bar =3D null) {
>     $bar =3D $bar ?: 'default';
> }
>
>
If you wanted to enforce the 'default' value to be the default if no
argument passed, then you could use $bar =3D 'default' in the method
signature.
So I guess that you use that construct to handle when the argument is
passed, but it contains a falsely value ("0", array(), 0, etc.).
I agree that this can be useful in some cases.


>
> I _always_ use 'null' as default
>

For me, it isn't always null, sometimes it is boolean true/false, or an
empty array.


>
> - If you want to omit a parameter, but want to set one after that, you
> don't need to look whats the default: It's 'null'
>

my IDE takes care of that problem for me.


> - Ive often enough seen something like
>
> function foo ($limit =3D 10) { /* code */ }
> // Somewhere else
> function bar ($limit =3D 50) { /* code */ $foo($limit); /* code */}
> // Even somewhere else
> bar();
>

same here.

--=20
Ferenc Kov=C3=A1cs
@Tyr43l - http://tyrael.hu

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