CODEWITHSUNDEEP
phpswitch-statementevaluation
James Andino
James Andino

Reputation: 25789

php switch case problem

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.

Upvotes: 4

Views: 3738

Answers (7)

Peter
Peter

Reputation: 2556

None of the answers presented so far have explicitly connected the spirit of the original question with a proper switch construction. So, for the record:

switch (true) {
    case (($level>-100) && ($level<100)):
        echo 'in range one';
        break;
    case (($level>200) && ($level<300)):
        echo 'in range two';
        break;
    default:
        echo 'out of range';
}

There's absolutely nothing wrong with this usage of switch.

Upvotes: 6

NikiC
NikiC

Reputation: 101946

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

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

Upvotes: 4

Timothy
Timothy

Reputation: 4650

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.

Upvotes: 2

Mark Snidovich
Mark Snidovich

Reputation: 1055

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.

Upvotes: -3

casablanca
casablanca

Reputation: 70721

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';

Upvotes: 4

Femaref
Femaref

Reputation: 61497

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;
}

Upvotes: 0

Mchl
Mchl

Reputation: 62395

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

Upvotes: 0

Related Questions