Dynamic check boxes

Anon

Hi
I have a number of check boxes which are produced dynamically and given the name chk$id[$arraycount] so chk1[0] for example and this works fine. However when I try to request the checkbox array on the next page i am having difficuly. If I echo $chk1[0] it works fine however if I try to concatenate the strings to do it dynamically it does not work. I tried

$var = "chk1[0]";
then
$array = ${$var};
and
$array = $$var;

Could someone please help me I would really appreciate it.

mdmann

When you say "it does not work," do you mean
you get an error message or you aren't get-
ting the results you expected? What exactly
do you get when you echo

1) $chk1[0]
2) ${$var}, after setting $var="chk1[0]"
3) $array

I do this type of thing with variable
variables all the time in my scripts, and
I'm not seeing anything wrong with what you
are trying to do.

Anon

When I echo $chk1[0] I get the value of this check box but when I try to use ${$var} and $var = "chk1[0]" it returns nothing there is no error just no value in the variable

mdmann

Daragh,

Ok, the problem appears to be that when you
have a variable variable as an array, there
is some ambiguity. If you have an array a,
then $$a[0] could mean

${$a[0]}

${$a}[0]

You have to specify which by use of the
curly braces. Now, the problem with what
you are trying to code is that by placing
the array index [0] in the $var variable,
you apparently force the system to use the
first interpretation. If, instead, you say

$var = "chk1";

and then echo ${var}[0], you should get
the value you want. I used this test script,
which you can use to see the behavior:

<?php

$chk1[0] = "This is a first test";
$var = "chk1";

echo "$chk1[0] $var " . ${$var}[0];

echo "";

$chk1[0] = "This is a second test";
$var = "chk1[0]";
echo "$chk1[0] $var " . ${$var};

Hope this helps.

Michael