What is the issue with the calculation operation in the provided PHP code?

The issue with the calculation operation in the provided PHP code is that the variable `$result` is not being updated correctly within the loop. Instead of using the assignment operator `=`, the code should use the addition assignment operator `+=` to accumulate the total sum of the numbers. This will ensure that the correct result is calculated.

// Incorrect code
$numbers = [1, 2, 3, 4, 5];
$result = 0;

foreach ($numbers as $number) {
    $result = $number; // This line overwrites the previous value of $result instead of adding to it
}

echo $result;

// Corrected code
$numbers = [1, 2, 3, 4, 5];
$result = 0;

foreach ($numbers as $number) {
    $result += $number; // Use addition assignment operator to accumulate the total sum
}

echo $result;