switch issue

Hello all,

Having a problem with the behaviour of switch when mixing variable types. Eg

$page = 'review';
switch ($page) {
case 0:
echo "0";
break;
case 'review':
echo "review";
break;
}
?>

this code interprets $page as 0 in the switch. It's not a problem to
alter 'review' to a number, just less elegant. Can anybody shed a
little light on mixed variable types in switch statements please?
While browsing the manual I noticed it performs "loose comparison" but
that seems to be the same as == ?

Many thanks,


Andy

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Re: switch issue

sublimino@gmail.com wrote:
> Hello all,
>
> Having a problem with the behaviour of switch when mixing variable types. Eg
>
> > $page = 'review';
> switch ($page) {
> case 0:
> echo "0";
> break;
> case 'review':
> echo "review";
> break;
> }
> ?>
>
> this code interprets $page as 0 in the switch. It's not a problem to
> alter 'review' to a number, just less elegant. Can anybody shed a
> little light on mixed variable types in switch statements please?
> While browsing the manual I noticed it performs "loose comparison" but
> that seems to be the same as == ?

My guess is that it's converting '$page' from a string to an int to do
the comparison because you don't have quotes around it.

If you do:

echo (int)'review';

you get 0.

If you look at the Loose Comparisons table here:

http://www.php.net/manual/en/types.comparisons.php#types.com parisions-loose

In the "php" column (second from the right), when compared to 0 without
quotes it evaluates to true, so it's expected behaviour.

So change it to:

case '0':
echo '0';
break;


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