On Sat, 1 Oct 2011, Mike Mackintosh wrote:
Best bet would to toss this into either an object or array for
simplification, otherwise that type of syntax would need the use of
eval.
example: eval('echo $trivia_answer_'.$correct_answer.';');
You could do:
$var = "trivia_answer_.$correct_answer";
echo $$var;
But I agree that an array would be simpler.
best bet would be to..
$trivia_answer = array();
$trivia_answer[1] = 1000;
$trivia_answer[2] = 1250;
$trivia_answer[3] = 2500;
$trivia_answer[4] = 5000;
echo $trivia_answer[$correct_answer];
You can define this a bit more simply:
$trivia_answer = array (
1 => 1000,
2 => 1250,
3 => 2500,
4 => 5000
);
You can do it even more simply by just giving the values, but indexes wil
start at 0:
<?php
$trivia_answer = array (1000, 1250, 2500, 5000);
print_r ($trivia_answer);
?>
Array
(
[0] => 1000
[1] => 1250
[2] => 2500
[3] => 5000
)
While manually defining an array like this is only slightly less tedius
than using 4 numbered variables, it's a lot easier to do if you're getting
data from somewhere else (e.g. a database of trivia questions). To use
the original way proposed, you'd have to keep constructing variable names,
which arrays avoid quite nicely.
In my opinion, the only real usefulness for a syntax like $$var (above) is
if you want to do something with a bunch of variables in one go. For
example:
foreach (array ("title", "artist", "album", "label") as $field)
echo ucwords($field) . ': ' . $$field . '<BR>';
The above comes from a function which manages only a single record, so no
real need to use an array. I could of course, e.g. record['title'] etc,
but I don't see much could be gained unless I needed to be able to manage
an entire record as a single unit.
Geoff.
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