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Date: Sat, 26 May 2007 20:43:44 +0200
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To: Gregory Beaver <greg@chiaraquartet.net>, internals@lists.php.net
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Subject: Re: [PHP-DEV] $var::$static
From: info@adaniels.nl (Arnold Daniels)

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Hi again,

I'm aware that you can do `$a = $group . '_' . $fn; $a();`, but you can 
do `$b = $group . '_' . $var; echo $$b;` as well as `echo ${$group . '_' 
. $var}`. It's a mater of style, not if there is any way to get it done.

Yes I've read about 'static::' some time ago, but forgot about it. 
Thanks for pointing it out. I (unfortunately) took that as an example, 
but it wasn't the case I wanted to make.

To my opinion, the ease with which you can use output of an expression 
to be used as name of a variable is wonderful. The code is so much 
clearer than when you have to create all kind of temporary variables 
and/or use eval. I think it is unfortunate that the same logic isn't 
available for functions and classes.

Best regards,
Arnold



Gregory Beaver wrote:
> Arnold Daniels wrote:
>   
>> Hi,
>>
>> I agree that $this::$var isn't really logical, since $this is an object
>> and not a class name. But I do not see why $class::$var shouldn't work,
>> or $class::$method() for that method. You can also do $function().
>>
>> Also I want to suggest that brackets can be used more freely. Currently
>> you can use ${$group . '_myvar'}, but you can't do the same for
>> functions and classes. It would be great if you could use {$group . '_'
>> . $fn}() and {get_class($this)}::$var.
>>
>> The way to solve this problems right now is to use eval('return ' .
>> get_class($this) . '::$var;') for getting the value. Getting a reference
>> to the variable to set it, is even more messy. You need to do something
>> like eval('$cvar =& ' . get_class($this) . '::$var;'); $cvar = 'bye';.
>>
>> Anyway, it is not so nice, but doable in user space fairly easily. So I
>> don't see why anything needs to be added in PHP 5. It would be nice to
>> have a better method in PHP 6 though.
>>
>> From Holland with love,
>> Arnold
>>     
>
> Hi Arnold,
>
> <?php
> $a = $group . '_' . $fn;
> $a();
> ?>
>
> As for get_class($this)::$var it pays to search the mailing list
> archives.  the static:: keyword is being using in PHP 6 to do exactly
> what you want from within a class.  Outside of a class, $var::$value
> doesn't work yet, but the implementation of static may make it possible
> to implement $var::$value as well.
>
> Greg
>
> P.S. The list archives are http://marc.info/?l=php-dev and are searchable
>
>   

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