Thanks! Torben.
I got the point now and it works! :-)
I'm doing this because the statements of each cases is quite long, and I wish to have minimum coding without repetition.



"Lars Torben Wilson" <larstor...@gmail.com> wrote in message news:36d4833b0908202323p3c858b5fn6a1d6775aa7f8...@mail.gmail.com...
2009/8/20 Keith <survivor_...@hotmail.com>:
Hi,
I encounter a funny limitation here with switch case as below:
The value for $sum is worked as expected for 1 to 8, but not for 0.
When the $sum=0, the first case will be return, which is "sum=8".
Is there any limitation / rules for switch case? Thanks for advice!

Keith

Hi Keith,

Try replacing 'switch($sum)' with 'switch(true)'.

Note that unless you have very good reasons for using a switch
statement like this, and know exactly why you're doing it, it's often
better just to use it in the normal fashion. i.e.:

      switch ($sum)
       {
       case 8:
           break;
       case 7:
       case 6:
           break;
       case 2:
       case 1:
           break;
       case 0:
           break;
default:
           break;
       }

Some people like the syntax you've presented but honestly, there's
usually a better way to do it.

This is also somewhat faster too, although you may only notice the
difference in very tight loops where you're counting every nanosecond.


Regards,

Torben

$sum=0;
switch($sum)
{
  case ($sum==8):
  echo "sum=8";
  break;
      case ($sum==7 || $sum==6):
      echo "sum=7 or 6";
      break;
  case ($sum==2 || $sum==1):
  echo "sum=2 or 1";
  break;
      case 0:
      echo "sum=0";
      break;
  default:
  echo "sum=3/4/5";
  break;
}
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