Switch isset and $_get

hey hi.....

I wanna make a switch wich does this:

if pagid is set do A,
if catid is set do B,
if projectid is set do C,
else do D.

So i was thinking something like this:

switch()
{
case isset ($_GET['pagid']):
{
echo "pagid= set";
}
break;
case isset ($_GET['catid']):
{
echo "catid= set";
}
break;
case isset ($_GET['projectid']):
{
echo "projectid= set";
}
break;
default:
{
echo "nothing set";
}
}


wich works great in my mind but not on my server....

Anybody here know how to do this in a way wich does work??

re: Switch isset and $_get

In article <453b9820$0$9457$ba620dc5@text.nova.planet.nl>, wouter
says...You don't need a switch here, but a if...elseif...else structure:

if( isset($_GET['pagid']) )
{
echo "pagid= set";
}
elseif( isset($_GET['catid']) )
{
echo "catid= set";
}
elseif( isset($_GET['projectid']) )
{
echo "projectid= set";
}
else
{
echo "nothing set";
}

--
PleegWat
Remove caps to reply

re: Switch isset and $_get

"wouter" <no@spam.nlwrote in message
news:453b9820$0$9457$ba620dc5@text.nova.planet.nl. ..You are mis-using the switch syntax check the manual
Switch only tests for different values in a single variable.

I assume from your text that the states are either mutually exclusive or
that pagid being set has precedence over the other variables
you could simply do this as if / elsif /elsif /else.

Cheers

Ron

re: Switch isset and $_get

OK if /else(if) it is...

Tx guys

re: Switch isset and $_get

wouter wrote:You need something to switch on
switch ($SOMETHING)
^^^^^^^^^^

The case expressions *must* all be different. In your example, as
isset() returns either `true` or `false` at least two of them will
be equal.

PHP will then compare the $SOMETHING to the case expressions and
continue the script execution from the case expression that matches.
If there are two or more matches, how will PHP know from which match to
start?
with if()s

if (isset($_GET['pagid'])) { echo "pagid= set"; }
elseif (isset($_GET['catid'])) { echo "catid= set"; }
elseif (isset($_GET['projectid'])) { echo "projectid= set"; }
else { echo "nothing set"; }

You might want to think about what happens if there's more than one of
those $_GET parameters set ...

Happy Coding :)

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If you *really* need to mail me,
use the address in the Reply-To header.

re: Switch isset and $_get

wouter wrote:
switch( true )
{

Contrary to the (non-)problem highlighted by another poster, having
several expressions here that could be true, is not a problem.

Switch will execute the first case it comes across which is valid. If
that case is closed by 'break;', it will then terminate the switch, if
the case is closed by 'continue;' it will continue to evaluate the other
options too.
In other words choosing the order of your cases is very important if you
use this syntax when several cases can be true.

On another note: the curly braces within your cases are not needed, a
brace surrounding your isset's is recommended. I.e.:
Would become:
case ( isset ($_GET['pagid']) ):
echo "pagid= set";
break;

or further on the case statement:
case ( isset ($_GET['pagid']) === true ):

Grz, Juliette

re: Switch isset and $_get

Juliette wrote:I apologize for not checking before posting (I was thinking C, where it
is illegal to have different cases with the same value).

Thank you for catching my error and calling attention to it.
`continue` will behave exactly like break.

When there is no match for the case expressions and there are several
`default` cases (illegal in C too), the one chosen seems to be the last
and not, as I expected, the first.

<?php
for ($i=0; $i<3; ++$i) {
switch ($i) {
case 1: echo "first case 1\n"; break;
case 2: echo "first case 2\n"; continue;
default: echo "first default\n"; continue;
case 1: echo "second case 1\n"; continue;
case 2: echo "second case 2\n"; break;
default: echo "second default\n"; break;
}
}
?>


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re: Switch isset and $_get

Pedro Graca wrote:No probs, happens to the best of us.
Oops, I posted this bit too quickly - not having anything, i.e. not
break, nor continue, will let the switch 'continue' / fall through and
continue with the next case.
I have never tested a switch with several 'default:' cases - as far as I
know, that /should/ be illegal in php too, but it being the flexible
language it is, it may only throw a warning or not even that.

Thanks for pointing out that it will use the last one in that case. I
would have expected it to execute both in the order it came across them,
but then again, thinking it over, the default in php by definition
should be the last case, so it only executing the last one shouldn't
surprise me.

No matter what, having several 'default:' cases is *always* highly
inadvisable.

re: Switch isset and $_get

Juliette wrote:SCNR
Having several `case CONSTANT:` with the same CONSTANT is ok? :)


<?php
$var = true;

echo "First set: ";
switch ($var) {
default: echo 'No variables in the list are'; break;
case isset($a): echo 'a is'; break;
case isset($b): echo 'b is'; break;
case isset($c): echo 'c is'; break;
case isset($d): echo 'd is'; break;
}
echo " set.\n";

$b = $c = 42;
echo "Second set: ";
switch ($var) {
default: echo 'No variables in the list are'; break;
case isset($a): echo 'a is'; break;
case isset($b): echo 'b is'; break;
case isset($c): echo 'c is'; break;
case isset($d): echo 'd is'; break;
}
echo " set.\n";
?>

To the Original Poster: don't use this code!

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re: Switch isset and $_get

Pedro Graca wrote:Well, it doesn't give an error, but it's operation is specified. So I
suspect if how it works changes you won't be able to do ant hying about it.

The bottom line is - the only defined behavior is to have a single
instance of a specific CONSTANT and a single default.

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