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Date: Thu, 21 Apr 2011 00:39:36 +0100
Message-ID: <BANLkTimoYbsoEdwn1dtbMWFFNZ0TcSVLOg@mail.gmail.com>
To: Mark <markg85@gmail.com>
Cc: "dante@lorenso.com" <dante@lorenso.com>, "internals@lists.php.net" <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Re: Function proposal: varset
From: arraypad@gmail.com (Arpad Ray)

On Wed, Apr 20, 2011 at 11:50 PM, Mark <markg85@gmail.com> wrote:
> On Wednesday, April 20, 2011, D. Dante Lorenso <dante@lorenso.com> wrote:
>> On 4/20/11 9:55 AM, Mark wrote:
>>
>> Hi,
>> This proposal is for the often called line like this:
>> $var =3D isset($_GET['var']) ? $_GET['var'] : '';
>> Only a shorter and imho a cleaner solution to get the same:
>> $var =3D varset($_GET['var']);
>>
>> The implementation for this in PHP code is this:
>>
>> # Arg 1 =3D the variable to check for existence
>> # Arg 2 =3D the default return value which is an empty string by default
>>
>> function varset($var, $default =3D '')
>> {
>> return (isset($var) ? $var : $default);
>> }
>>
>>
>> I proposed something similar over 5 years ago. =A0It ain't gonna happen =
because PHP language can't support it. =A0The Zend engine needs to be rewri=
tten to remove the warnings and that's not something they are volunteering =
to do no matter how much people want it.
>>
>> =A0=A0http://markmail.org/message/yl26ebzcix35wtke
>>
>> My proposal was called "filled" since it was the opposite of "empty" whi=
ch already existed. =A0I extended the function to return the first non-empt=
y value or null if all values evaluated as empty.
>>
>> You could use the function like this:
>>
>> =A0=A0$x =3D filled($_GET['x'], $obj->something, $default, 'default');
>>
>> It would return the first argument where !empty($arg) evaluates as TRUE.
>>
>> There would need to be a companion function to check 'isset' opposite as=
 you have proposed.
>>
>> Like I said, though, I don't think this can be done in the language beca=
use I think they ran out of OPCODES and would have to tear apart the whole =
PHP engine to support such a feature.
>>
>> -- Dante
>>
>> --
>> PHP Internals - PHP Runtime Development Mailing List
>> To unsubscribe, visit: http://www.php.net/unsub.php
>>
>>
> Hi,
>
> well, i did propose 2 possible ways although the second one is a
> little longer but still clean and readable.
> And the second one is certainly possible to implement!
>
> Btw. i did look at the suggested core php code parts and even though i
> can do nearly everything in php.. i have a hard time understanding how
> the inner php parsing things actually work. There is no way i'm able
> to make a patch for php.
>
> Regards,
> Mark
>
> --
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>

Hi,

As Hannes said, the other thread discussing this feature (although the
subject line may suggest otherwise) is still active, so please move
this discussion there:
"[PHP-DEV] Implicit isset/isempty check on short-ternary operator"

Cheers,

Arpad