[Solved] Given this multidimensional array representing students and their scores:$students = [ ['name' => 'Alice', 'scores' => [85, 90]], ['name' => 'Bob', 'scores' => [78, 82]], ['name' => 'Charlie',... | PHP

PHP - Arrays

Given this multidimensional array representing students and their scores:

$students = [
  ['name' => 'Alice', 'scores' => [85, 90]],
  ['name' => 'Bob', 'scores' => [78, 82]],
  ['name' => 'Charlie', 'scores' => [92, 88]]
];

Which code correctly calculates and prints the average score of Bob?

A$avg = array_sum($students[2]['scores']) / count($students[2]['scores']);<br>echo $avg;

B$avg = array_sum($students['Bob']['scores']) / count($students['Bob']['scores']);<br>echo $avg;

C$avg = array_sum($students[1]['score']) / count($students[1]['score']);<br>echo $avg;

D$avg = array_sum($students[1]['scores']) / count($students[1]['scores']);<br>echo $avg;

Step-by-Step Solution

Solution:

Step 1: Locate Bob's data in the array
Bob is at index 1, and his scores are under the key 'scores'.
Step 2: Calculate average correctly
Use array_sum and count on $students[1]['scores'] to get average. $avg = array_sum($students[1]['scores']) / count($students[1]['scores']);
echo $avg; does this correctly.
Final Answer:
$avg = array_sum($students[1]['scores']) / count($students[1]['scores']); echo $avg; -> Option D
Quick Check:
Index 1 and 'scores' key used correctly [OK]

Quick Trick: Use numeric index for array, string keys for inner arrays [OK]

Common Mistakes:

Using string key for outer array
Misspelling 'scores' key
Using wrong index for Bob

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More PHP Quizzes

Given this multidimensional array representing students and their scores:

Step 1: Locate Bob's data in the array

Step 2: Calculate average correctly

Final Answer:

Quick Check:

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