[PHP] Re: Variable Variables and Super Global Arrays

[ANR Daemon]

Greetings, daniel danon.
In reply to Your message dated Saturday, October 11, 2008, 2:50:34,

 By php.net manual, Please note that variable variables cannot be used with
 PHP's Superglobal arrays  within functions or class methods. Is there any
 way to override this problem? Just the not nice eval(return $variable);?

 and in simple words - is there any way to make the following code work:

 $varname = \$_SERVER['REMOTE_ADDR'];
 $varvalue = $$varname;


First of all, why you need it to work?
Explain real case please.


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[PHP] Re: Variable variables

[James Benson]

Mark Steudel wrote:

I was wondering if you could create variable variables for objects, please
see examples below, Im having problems getting it to work.

$data['fieldname'] = foo;
 
// without variable variables

$res = $db-query( SELECT foo FROM table );
 
while( $res-fetchInto( $db_data ) )

{
echo $db_data-foo; // pretend this echos bar
}
 
 
 // with variable variables

$varVar = '$db_data-'.$data['fieldname']; // should be $db_data-foo
 



Try using double quotes, ie.

$varVar = $db_data-.$data['fieldname'];




James

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[PHP] Re: Variable variables

[M. Sokolewicz]

Janbro wrote:
Hi List,

I'm  using PHP5 with global variables off. I've got  around 20 dynamically
generated forms with a total of 300 different variables sent thru these
forms. I'd like to use variable variables, but according to the manual this
is not possible.
Now comes my Questoin, how do I receive my variables  which have the form
$a_123 or $a_124[]. Is there a workaround for PHP5 or PHP in general?
euh, if you're gonna do that automatically, then that's *exactly* the 
same as setting register_globals = On.

Who do I make  $data = $_REQUEST['a_123'] work ???
what's wrong with that? if it gets sent under the name 'a_123' then 
that'll work fine I don't see your problem :S

 I'd hate to set global
variables to on, as I'm dealing with sensitive data.

Thx
JanBro
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[PHP] Re: Variable Variables and Mulitdimensional Arrays

[Joe Webster]

You seem to have three different ideas/questions... let me attempt to answer
them:

 Hi. I want to be able to access a key in a multidimensional array at some
 depth n without knowing before runtime what the keys are.

let's take a multidimensional array $x
$x = array(
somevar,
array(
otherval,
evenmore
)
);

echo $x[0]; should print 'somevar'
echo $x[1]; should print 'Array'
echo $x[1][0]; should print 'otherval'
echo $x[1][1]; should print 'evenmore'


 I thought this might be possible using variable variables. Here's some
 sample code using variable variables and multidimensional arrays:
 $y = 'a';
 $z = 'b';
 $t = 'c';
 $x = array(a=array(b=array(c=TRUE)));


 // I want to be able to concatenate the array indexes into one variable
 variable. This would be done in a loop at runtime.
if you want to concat all the key's of an array with a loop you could do:

reset($x); //just to make sure we are at the first key
while(list($key,$val) = each($x)){
$my_keys .= $key
}
echo $my_keys;

should result in: (using $x from my code above)

1 (I think it might even come out as 01 -- but probally 1 since it will be
treated as a int maybe =) )


 Any help would greatly be appreciated,

 Charlie



Hope that helps, still not sure what your question was or if i answered it
;)

-Joe



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[PHP] Re: variable variables and eval

[Richard Lynch]

 i have come across a strange problem with variable variables. Basicly i'm
 doing the following and its not working:

 $section = 'data[SITE][0][NAME][0]';
 $pData = 'My Site.';
 ${sprintf('$%s', $section)}.=$pData;

 but it is not working. But if i do this:

 eval('$'.$section.'.='.addslashes($pData).';');

 it works and all is well. I don't really want to use eval() and just
 wanted to see if anybody has any ideas why the above doesn't work.

Why is the sprintf in there?...

Try this:

${$section} .= $pData;

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