How can the variable $zahl be properly incremented to count the number of entries in the guestbook?

To properly increment the variable $zahl to count the number of entries in the guestbook, you can initialize $zahl to 0 before starting the loop that reads each entry in the guestbook. Inside the loop, you can increment $zahl by 1 for each entry read. This way, $zahl will accurately represent the total number of entries in the guestbook.

$zahl = 0; // Initialize $zahl to 0
while($row = mysqli_fetch_array($result)) {
    // Process each entry in the guestbook
    // Increment $zahl by 1 for each entry
    $zahl++;
}
echo "Total number of entries in the guestbook: " . $zahl;