Re: PHP - How Practical Is This?
- From: "Octavian Rasnita" <orasnita@xxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Fri, 8 Aug 2008 12:56:28 +0300
You can also do that with perl. Here is an example of a short program that uses
variables as labels:
$label = "ONE";
goto $label;
$label = "TWO";
goto $label;
exit;
ONE: print "1\n";
TWO: print "2\n";
Octavian
----- Original Message -----
From: "tribble" <lauraeaves@xxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Friday, August 08, 2008 11:54 AM
Subject: Re: PHP - How Practical Is This?
> That reminds me of the old snobol programming language which supported this
> as well. In fact, it went a step further and allowed you to jump to a label
> whose name was the value of a variable. Now that made for some interesting
> code.
> --le
>
>
> ----- Original Message -----
> From: "Sina Bahram" <sbahram@xxxxxxxxx>
> To: <programmingblind@xxxxxxxxxxxxx>
> Sent: Thursday, August 07, 2008 10:20 PM
> Subject: RE: PHP - How Practical Is This?
>
>
> Wow, I had totally forgot about this.
>
> So basically, imagine if you wanted to dynamically choose a variable ... if,
> let's say, the name of the variable, was itself a variable.
>
> Like this:
>
> $cat = 0;
> $dog = 0;
> $snake = 0;
>
> function incrementCountOfPets($pet)
> {
> $$pet++;
> }
>
>
> Now, if you passed the string "cat" into that function, the cat variable
> would be incremented, but if you passed in the string "dog", the dog
> variable would be incremented.
>
> If you didn't have this feature, you would be forced to using an if
> statement or a switch/case statement block.
>
> It is truly mind boggling how many good design principles languages such as
> php can allow one to break, *smile*.
>
> Take care,
> Sina
>
> -----Original Message-----
> From: programmingblind-bounce@xxxxxxxxxxxxx
> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of
> james.homme@xxxxxxxxxxxx
> Sent: Tuesday, August 05, 2008 7:35 AM
> To: programmingblind@xxxxxxxxxxxxx
> Subject: PHP - How Practical Is This?
>
>
> Hi,
> I don't understand how this works, so I don't know how important or
> practical it is. This is some text from a PHP book I'm reading.
>
> Variable Variables
>
> On occasion, you may want to use a variable whose content can be treated
> dynamically
> as a variable in itself. Consider this typical variable assignment:
> $recipe = "spaghetti";
> Interestingly, you can treat the value spaghetti as a variable by placing a
> second
> dollar sign in front of the original variable name and again assigning
> another value:
> $$recipe = "& meatballs";
> This in effect assigns & meatballs to a variable named spaghetti.
> Therefore, the following two snippets of code produce the same result:
> echo $recipe $spaghetti;
> echo $recipe ${$recipe};
> The result of both is the string spaghetti & meatballs.
>
> Thanks.
>
> Jim
> James D Homme, Usability Engineering, Highmark Inc.,
> james.homme@xxxxxxxxxxxx, 412-544-1810
>
> "The difference between those who get what they wish for and those who
> don't is action. Therefore, every action you take is a complete
> success,regardless of the results." -- Jerrold Mundis
> Highmark internal only: For usability and accessibility:
> http://highwire.highmark.com/sites/iwov/hwt093/
>
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