"const" keyword in PHP4? What does it do?

[Joshua Beall]

Hi All,

What does the "const" reserved word in PHP4 do? I know it is a reserved
word in PHP4, but the only references I can find to it are for PHP5.

Here's what I want to do:

Rather than using define(), I'd like to declare a variable as a constant.
This way, I can use it in strings. Specifically, in heredoc strings -
constants don't get interpreted in between <<<EOT and EOT;

Any ideas?

-Josh

[Janwillem Borleffs]

Re: &quot;const&quo t; keyword in PHP4? What does it do?

Joshua Beall wrote:[color=blue]
> What does the "const" reserved word in PHP4 do? I know it is a
> reserved word in PHP4, but the only references I can find to it are
> for PHP5.
>[/color]

It doesn't do anything in PHP 4 except triggering a parse error. It's used
in PHP 5 for property declarations within classes:

class Foo {
const BAR = "bar";
}
[color=blue]
> Here's what I want to do:
>
> Rather than using define(), I'd like to declare a variable as a
> constant. This way, I can use it in strings. Specifically, in
> heredoc strings - constants don't get interpreted in between <<<EOT
> and EOT;
>[/color]

Constants cannot be used in heredocs notation (not in PHP 4, not in PHP 5).
If you want use the value of a constant in this context anyway, you should
store it in a variable first.


JW

[Gernot Frisch]

Re: &quot;const&quo t; keyword in PHP4? What does it do?


"Joshua Beall" <jbeall@donotsp am.remove.me.he raldic.us> schrieb im
Newsbeitrag news:Bt2Xc.461$ Cc.309@trnddc07 ...[color=blue]
> Hi All,
>
> What does the "const" reserved word in PHP4 do? I know it is a[/color]
reserved[color=blue]
> word in PHP4, but the only references I can find to it are for PHP5.
>
> Here's what I want to do:
>
> Rather than using define(), I'd like to declare a variable as a[/color]
constant.[color=blue]
> This way, I can use it in strings. Specifically, in heredoc[/color]
strings -[color=blue]
> constants don't get interpreted in between <<<EOT and EOT;
>
> Any ideas?[/color]

I don't know,. but I could think of making a variable 'const', thus
not allowing to alter it:

const $myvar=0.002;
$myvar = 1.0; // should give an error!?

I don't know.