inherited scope in a function (CFPARAM)

[Indrid Cold]

Is there a way to call a function so the function shares the scope of the
caller?

For example, I was playing around with making a php version of the cold
fusion tag CFPARAM

What that cold fusion tag/sorta-function does is:
1) Check if a variable exists
2) If it doesn't, creat it with a default value

I could do it inline like this:
eval("if(empty( \$testVar)) \testVar=null;" );

but I don't see how I could do it as a function, like say
phParam("test")
.... is there any way for php to see all variables in the caller's scope
without passing them in or declaring them all global?

[Andy Hassall]

Re: inherited scope in a function (CFPARAM)

On Sun, 29 Feb 2004 15:44:40 GMT, Indrid Cold <nobody@nowhere .com> wrote:
[color=blue]
>Is there a way to call a function so the function shares the scope of the
>caller?
>... is there any way for php to see all variables in the caller's scope
>without passing them in or declaring them all global?[/color]

Not that I'm aware of.

--
Andy Hassall <andy@andyh.co. uk> / Space: disk usage analysis tool
<http://www.andyh.co.uk > / <http://www.andyhsoftwa re.co.uk/space>

[Bruno Desthuilliers]

Re: inherited scope in a function (CFPARAM)

Indrid Cold wrote:[color=blue]
> Is there a way to call a function so the function shares the scope of the
> caller?
>
> For example, I was playing around with making a php version of the cold
> fusion tag CFPARAM
>
> What that cold fusion tag/sorta-function does is:
> 1) Check if a variable exists
> 2) If it doesn't, creat it with a default value
>
> I could do it inline like this:
> eval("if(empty( \$testVar)) \testVar=null;" );
>
> but I don't see how I could do it as a function, like say
> phParam("test")
> ... is there any way for php to see all variables in the caller's scope
> without passing them in or declaring them all global?[/color]

The good news is that you can quite easily solve the problem of passing
vars as params, with get_defined_var s, compact() and extract() :

<?php
$glo = array(1, 1, 2, 3, 5, 8);

function caller($arg1, $arg2) {
global $glo;
$loc = 33;
$arr = get_defined_var s();

// show what is defined in the current scope :
echo "<hr>\nIn caller :<br>\n"
. nl2br(var_expor t($arr, true)) . "<hr>\n";

// and pass all context to the callee
callee(compact( array_keys($arr )));
}


function callee($args) {
extract($args);
unset($args); // optional...
// show what is defined in the current scope :
echo "<hr>\nIn caller :<br>\n"
. nl2br(var_expor t(get_defined_v ars(), true)) . "<hr>\n";
}

caller('meaning oflife', 42);
?>

The bad news is that if you need to share so much state, then your
design is probably a bit flawed.

My 2 cents,
Bruno