Eval, Variable Variables problem

[Ted]

I have a small pre-determined number of possible values for a variable, and
I would like to set a value for the corresponding 'switch type' variable.

For example, if $x is 14, I want to execute the following statement:
$switch_14 = "on";

In general, I want something like this:
$switch_.$x = "on";

I know I could build a switch/case structure since the values for $x are
known and there are only a dozen or so of them, but it would seem more
elegant and/or compact to do it another way.

I've looked at eval() and variable variables and can't seem to get anything
to work.
I've also read the quote "If eval is the answer, you're asking the wrong
question".

Thanks for any help you can provide.

T

[Michael Fesser]

Re: Eval, Variable Variables problem

..oO(Ted)

>I have a small pre-determined number of possible values for a variable, and
>I would like to set a value for the corresponding 'switch type' variable.
>
>For example, if $x is 14, I want to execute the following statement:
$switch_14 = "on";
>
>In general, I want something like this:
$switch_.$x = "on";

You're looking for an array:

$switch[$x] = TRUE;

Micha

[Rik]

Re: Eval, Variable Variables problem

Ted wrote:

I have a small pre-determined number of possible values for a
variable, and I would like to set a value for the corresponding
'switch type' variable.
>
For example, if $x is 14, I want to execute the following statement:
$switch_14 = "on";
>
In general, I want something like this:
$switch_.$x = "on";
>
I know I could build a switch/case structure since the values for $x
are known and there are only a dozen or so of them, but it would seem
more elegant and/or compact to do it another way.
>
I've looked at eval() and variable variables and can't seem to get
anything to work.
I've also read the quote "If eval is the answer, you're asking the
wrong question".
>
Thanks for any help you can provide.

As said, you probably want an array. However, if you want to stick with
your way, I think this will work (untested):

${'switch_'.$i} = 'on';
--
Rik Wasmus

[Hendri Kurniawan]

Re: Eval, Variable Variables problem

Just a suggestion.. Why not use array?

$switches = array();
$switches[$x] = 'on';

That way it's cleaner, and no need to change any
switches or cases values later on when you
decided to change the $x to char or word for example.

Hendri Kurniawan


Ted wrote:

I have a small pre-determined number of possible values for a variable, and
I would like to set a value for the corresponding 'switch type' variable.
>
For example, if $x is 14, I want to execute the following statement:
$switch_14 = "on";
>
In general, I want something like this:
$switch_.$x = "on";
>
I know I could build a switch/case structure since the values for $x are
known and there are only a dozen or so of them, but it would seem more
elegant and/or compact to do it another way.
>
I've looked at eval() and variable variables and can't seem to get anything
to work.
I've also read the quote "If eval is the answer, you're asking the wrong
question".
>
Thanks for any help you can provide.
>
T
>
>

[BlueNosE]

Re: Eval, Variable Variables problem

you may do:

$x = 1;
$name = "var_{$x}";
$$name = "On";

echo $var_1;// On