Undefined offset

Posted on 16th Feb 2014 by admin

The following script checks to see if the user answer matches the correct answer.

Form Fields are set up the following way...

user_answer[$i] | value = a
user_answer[$i] | value = b
user_answer[$i] | value = c

all radio fields (above)

orgid[$i] | value = $i
answer[$i] | value = (a or b, c)

all hidden fields (above)

$i = question id/number

Basically when question answer isn't selected an undefined offset error message is generated. Adding if empty or isset messes up the order.


Code: foreach ($_POST['orgid'] as $k =>$v) {
$orgid[$k] = $v;
}

$k = 0;
$m = 0;
while ($k <= 19) {
if ($_POST['user_answer'][$k] == $_POST['answer'][$k]) {
$correct++;

unset ($_POST['user_answer'][$k]);
unset ($orgid[$k]);
} else {
$incorrect++;
}
$k++;
}
Any ideas/suggestions?

Other php-forum