I am unable to provide a better definition that "user defined variables".
User defined variables are variables that are declared by the user. User
here means the creator (or maintainer of the script).
So for:
<?php
$a = 'A';
$b = 'B';
$c = 'C';
function globals() {
$globals = $GLOBALS;
print_r("Before...");
print_r($globals);
foreach (array(
'GLOBALS',
'_ENV',
'HTTP_ENV_VARS',
'_POST',
'HTTP_POST_VARS',
'_GET',
'HTTP_GET_VARS',
'_COOKIE',
'HTTP_COOKIE_VARS',
'_SERVER',
'HTTP_SERVER_VARS',
'_FILES',
'HTTP_POST_FILES',
'_REQUEST'
) as $var) {
unset($globals[$var]);
}
print("<br />After...");
print_r($globals);
return $globals;
}
globals();
?>
You will get: Array( [a] = A [b] => B [c] => C ). $a, $b and $c are user
defined variables.
On Mon, Mar 7, 2011 at 7:54 AM, Ashim Kapoor <[email protected]> wrote:
>
>
> Unsetting doesn't leave user defined variables. Unsetting simply destroys
>> variables (or removes elements from an array, etc). There is nothing magic
>> or hidden in that script. I think the note meant exactly what it said: after
>> creating a local copy of the $GLOBALS array and removing super globals from
>> it, all that's left in it are user defined variables. And that's exactly
>> what gets returned from the function.
>
>
>
> This is a script vars.php
>
>
> <?php
> function globals() {
> $globals = $GLOBALS;
> print_r("Before...");
> print_r($globals);
>
> foreach (array(
> 'GLOBALS',
> '_ENV',
> 'HTTP_ENV_VARS',
> '_POST',
> 'HTTP_POST_VARS',
> '_GET',
> 'HTTP_GET_VARS',
> '_COOKIE',
> 'HTTP_COOKIE_VARS',
> '_SERVER',
> 'HTTP_SERVER_VARS',
> '_FILES',
> 'HTTP_POST_FILES',
> '_REQUEST'
> ) as $var) {
> unset($globals[$var]);
> }
> print("<br />After...");
> print_r($globals);
>
> return $globals;
> }
>
> globals();
> ?>
>
> I called http://localhost/vars.php?a=1
>
> I get : -
>
> Before...Array ( [GLOBALS] => Array *RECURSION* [_POST] => Array ( ) [_GET]
> => Array ( [a] => 1 ) [_COOKIE] => Array ( ) [_FILES] => Array ( ) )
> After...Array ( )
>
> ALL the variables are UNSET. I have a user defined $_GET[a] but that goes
> away too.
>
> One second, what do you mean by user defined variables? Maybe I am lost in
> comprehension
