值为零时PHP脚本错误

Question

I not understand little bit. Simple switch statement not working correctly with zero value (=0):

//$result = $sql->fetchColumn(); 
$result = 1;
      switch ($result) {    
          case $result <= 2 :
              throw new Exception('Error!');
              break;
                        }

Problem is when $result = 0 then output should be 'error' but in this case script passing this validation. Weird question but i can't find a problem.

Answer 1

You can write it like that:

<?php
switch ($i) {
case 0:
case 1:
case 2:
    throw new Exception('Error!');
    break;
case 3:
    echo "i is 3 or higher.";
}
?>

As I said in my comment above, you can't use "grater than" "less than" etc. in a switch-statement. As other said, if you want to make use of them, use a simple IF statement.