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" <larstorben@xxxxxxxxx> wrote in message
news:36d4833b0908202323p3c858b5fn6a1d6775aa7f8997@xxxxxxxxxxxxxxxxx
2009/8/20 Keith <survivor_bus@xxxxxxxxxxx>:
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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