数组中数组的非法字符串偏移量

Question

I have the main array called $quizzes which contains the collection of $Quiz. Each $Quiz has the following fields: $Quiz['correct'] gives me the number of correct questions.

I can get the number of correct questions for 12th quiz using $quizzes[12]['correct']

However, since these quizzes are not displayed in order, I decided to define a new array:

$listoftests = array('$quizzes[30]','$quizzes[51]');

In my head, $listoftests[0]['correct'] should be equal to $quizzes[30]['correct'] but it's giving me

Warning: Illegal string offset 'correct' in /demo.php on line 14 $

when I try to echo $listoftests[0]['correct'];

Answer 1

In this $listoftests = array('$quizzes[30]','$quizzes[51]'); These are considered as two strings $quizzes[30] and $quizzes[51]. You should remove single quotes ' and try again.

Change this:

$listoftests = array('$quizzes[30]','$quizzes[51]');

To:

$listoftests = array($quizzes[30],$quizzes[51]);