Why does just a PHP script hang?

Question

PHP

Hello! I'm doing a simple task in PHP, but I don't understand why everything freezes. Or I learned by heart and do not see some details, tell me)

<p>Выводим сумму четных чисел от 10 до 40</p>
<?php 

$summ = 0;
$num = 10;

while($num <= 40){
    
    if(($num%2) != 0) continue;
    $summ += $num;
    $num++;
}

echo $summ;

 ?>

Answer 1

continue is used inside loop structures to skip the rest of the current loop iteration and, if conditions are met, start the next iteration.
11 is always less than 40, so the loop will be infinite