php switch case problem

Question

I am trying to say $level > -100 && $level < 100

$level  = 0;

                switch($level){                                                                                       

                case $level > -100:                                                                                   
                break;
                case $level <  100:                                                                                   
                break;
                default:
                echo '5';
                return null;                                                                                          
                }              

can you use a switch statement like this.

Answer 1

No you can't. Switch does only 'equals' type comparison.

Answer 2

No, you can't. The switch statement needs literals in the case blocks. Use an if statements instead:

if(!($level > -100 && $level < 100))
{
  echo '5';
  return null;
}

Answer 3

When you say switch ($level) you're already comparing the value of $level. Each case can then only check for equality, you can't do comparisons like in your example. You'll have to use an if statement instead:

if ($level > -100 && $level < 100)
  ; // do nothing; equivalent of break in this case
else
  echo '5';

Even simpler, just negate the conditions:

if ($level <= -100 || $level >= 100)
  echo '5';

Answer 4

No. Switch statements can only use hard values. You need to convert this to an if statement:'

if($level > -100)
{

}
else if($level < 100)
{

}                                                                                      
else
{
     echo '5';
     return null;                                              
}   

Answer 5

This is one of the reasons people advocating case as a superior solution to if-else are off base. I don't like the syntax or the limitations - if-ifelse-else is much more useful.

Answer 6

The other answers are both correct and incorrect at the same time. Incorrect, in that it is possible to do what you want in PHP... change switch($level) to switch(true) and your example will work. Correct, in that it's bad form and if any other programmers see that in your code they'll probably come after you with pitchforks. Its not how the switch statement is intended to be used, and wouldn't work like that in most other languages.

Answer 7

Easy Dude

switch($level) {
      case (($level > -100) && ($level < 100)):
            //Do your stuff
      break;
}

COPY AND PASTE THIS TO CHECK THIS

<?
$level = 50;
switch($level) {
    case (($level>-100) && ($level<100)):
            echo "correct";
        break;
    }
?>

Answer 8

Apart of if/else, another way to do it:

switch (true)                                                                               
    case $level > -100:
        break;
    case $level <  100:
        break;
    default:
        echo '5';
        return null;
}