Is there limitation for switch case: argument's value?

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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

$sum=0;	
switch($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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