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Posted by mootmail-googlegroups on 08/30/06 13:52
Norman Peelman wrote:
> <kurrent@gmail.com> wrote in message
> news:1156886642.624061.318070@m73g2000cwd.googlegroups.com...
> > I am relatively new to PHP and just have a question regarding $_POST to
> > get a value passed via a form to be included of the parameter of an
> > array I am using:
> >
> > eg.
> >
> > <?
> >
> > $a array = ("1", "2", "3");
> >
> > echo "<form method=POST>
> >
> > <select name=b size=1>
> > <option value=1>number1</option>
> > <option value=2>number2</option>
> > <option value=0>number3</option>
> > </select>
> >
> > <input type=submit name=Submit>
> >
> >
> > </form>";
> >
> > echo "$a[$b]";
> >
> >
> > Since I have a global variables turned off, and would like to keep
> > learning with them off, I am stumped on to get that value passed
> >
> >
> > >From my understanding, I see that $_POST[b] would successfully retrive
> > the value of the $b variable. So i've tried many variants on the syntax
> > but no luck (e.g. "$a[$_POST[b]]) etc...
> >
> > any help is much appreciated :) thanks!
> >
>
> How about: echo "{$a[$_POST['b']]}";
>
> Norm
Building upon that advice, there is a limitation when using
double-quoted strings in PHP which you should be aware of.
Double-quoted strings will be parsed for variables, however only of the
simplest types. Anything more complex needs to be encased in curly
braces { } in order to be evaluated.
So while you can do:
echo "$foo"; \\evaluates variable $foo
You cannot do:
echo "$foo['a']";
echo "$foo[$x]";
echo "$foo->x";
Instead, you must do:
echo "{$foo['a']}";
echo "{$foo[$x]}";
echo "{$foo->x}";
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