php-general Digest 17 Nov 2012 01:00:54 -0000 Issue 8043
Topics (messages 319712 through 319717):
re:Switch - Case Statement Questions
319712 by: Omar Muhsin
319713 by: Ken Robinson
319716 by: Iñigo Medina
Re: Switch - Case Statement Questions
319714 by: Tim Streater
319715 by: Sebastian Krebs
319717 by: Jim Giner
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----------------------------------------------------------------------
--- Begin Message ---
Hello,
I was just wondering after writting the code in version 2 here below, it turns
out in testing that it actually PHP is not validating the expressions instead
always I get the first case.
1.Using nested if statement {THE INTENDED BEHAVIOR}:
if ($count > 14)
$boxes = 3;
elseif($count > 7 && $count <= 14)
$boxes = 2;
else
$boxes = 1;
2. Using Switch {ALWAYS FIRST CASE!!!}
// $boxes = 1;
// switch ($count) {
// case ($count > 14):
// $boxes = 3;
// break;
// case ($count > 7 && $count <= 14):
// $boxes = 2;
// break;
// case ($count <= 7):
// default :
// $boxes = 1;
// break;
// }
Does anyone know the answer why using the Switch it always execute the first
case ?
Many thanks
Omar
--- End Message ---
--- Begin Message ---
At 07:10 AM 11/16/2012, Omar Muhsin wrote:
Hello,
I was just wondering after writting the code in version 2 here
below, it turns out in testing that it actually PHP is not
validating the expressions instead always I get the first case.
1.Using nested if statement {THE INTENDED BEHAVIOR}:
if ($count > 14)
$boxes = 3;
elseif($count > 7 && $count <= 14)
$boxes = 2;
else
$boxes = 1;
2. Using Switch {ALWAYS FIRST CASE!!!}
// $boxes = 1;
// switch ($count) {
// case ($count > 14):
// $boxes = 3;
// break;
// case ($count > 7 && $count <= 14):
// $boxes = 2;
// break;
// case ($count <= 7):
// default :
// $boxes = 1;
// break;
// }
For the switch statement to work, you need to use "switch (true)"
$boxes = 1;
switch (true) {
case ($count > 14):
$boxes = 3;
break;
case ($count > 7 && $count <= 14):
$boxes = 2;
break;
case ($count <= 7):
default :
$boxes = 1;
break;
}
BTW, you don't need the "break" statement at the end of the last case
and you don't really need the "case ($count <= 7)" since that
condition is what remains anyway.
Ken
--- End Message ---
--- Begin Message ---
On Fri, 16 Nov 2012, Ken Robinson wrote:
At 07:10 AM 11/16/2012, Omar Muhsin wrote:
Hello,
I was just wondering after writting the code in version 2 here below, it
turns out in testing that it actually PHP is not validating the expressions
instead always I get the first case.
1.Using nested if statement {THE INTENDED BEHAVIOR}:
if ($count > 14)
$boxes = 3;
elseif($count > 7 && $count <= 14)
$boxes = 2;
else
$boxes = 1;
2. Using Switch {ALWAYS FIRST CASE!!!}
// $boxes = 1;
// switch ($count) {
// case ($count > 14):
// $boxes = 3;
// break;
// case ($count > 7 && $count <= 14):
// $boxes = 2;
// break;
// case ($count <= 7):
// default :
// $boxes = 1;
// break;
// }
For the switch statement to work, you need to use "switch (true)"
$boxes = 1;
switch (true) {
case ($count > 14):
$boxes = 3;
break;
case ($count > 7 && $count <= 14):
$boxes = 2;
break;
case ($count <= 7):
default :
$boxes = 1;
break;
}
I understand you use `switch` there for answering the question 'which of the
n following questions is true'. But how do you evaluate `$count`?
iñ
BTW, you don't need the "break" statement at the end of the last case and you
don't really need the "case ($count <= 7)" since that condition is what
remains anyway.
Ken
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--- End Message ---
--- Begin Message ---
On 16 Nov 2012 at 12:10, Omar Muhsin <mrfroa...@gmail.com> wrote:
> Hello,
>
> I was just wondering after writting the code in version 2 here below, it turns
> out in testing that it actually PHP is not validating the expressions instead
> always I get the first case.
>
> 1.Using nested if statement {THE INTENDED BEHAVIOR}:
> if ($count > 14)
> $boxes = 3;
> elseif($count > 7 && $count <= 14)
You don't need the count<=14 part as you will *only* get there if $count<=14.
> $boxes = 2;
> else
> $boxes = 1;
>
> 2. Using Switch {ALWAYS FIRST CASE!!!}
>
> // $boxes = 1;
> // switch ($count) {
> // case ($count > 14):
> // $boxes = 3;
> // break;
> // case ($count > 7 && $count <= 14):
> // $boxes = 2;
> // break;
> // case ($count <= 7):
> // default :
> // $boxes = 1;
> // break;
> // }
>
>
> Does anyone know the answer why using the Switch it always execute the first
> case ?
As has been pointed out you need switch(true).
That's a strange way of writing a switch, IMO. You should be using the if
version.
--
Cheers -- Tim
--- End Message ---
--- Begin Message ---
2012/11/16 Tim Streater <t...@clothears.org.uk>
> On 16 Nov 2012 at 12:10, Omar Muhsin <mrfroa...@gmail.com> wrote:
>
> > Hello,
> >
> > I was just wondering after writting the code in version 2 here below, it
> turns
> > out in testing that it actually PHP is not validating the expressions
> instead
> > always I get the first case.
> >
> > 1.Using nested if statement {THE INTENDED BEHAVIOR}:
> > if ($count > 14)
> > $boxes = 3;
> > elseif($count > 7 && $count <= 14)
>
> You don't need the count<=14 part as you will *only* get there if
> $count<=14.
>
> > $boxes = 2;
> > else
> > $boxes = 1;
> >
> > 2. Using Switch {ALWAYS FIRST CASE!!!}
> >
> > // $boxes = 1;
> > // switch ($count) {
> > // case ($count > 14):
> > // $boxes = 3;
> > // break;
> > // case ($count > 7 && $count <= 14):
> > // $boxes = 2;
> > // break;
> > // case ($count <= 7):
> > // default :
> > // $boxes = 1;
> > // break;
> > // }
> >
> >
> > Does anyone know the answer why using the Switch it always execute the
> first
> > case ?
>
> As has been pointed out you need switch(true).
>
> That's a strange way of writing a switch, IMO. You should be using the if
> version.
>
Hi,
I've seen looooong discussions about this ;) I think this one is a example,
where 'switch(true)' is a legit expression, because switch-statements
define a construct, where the interpreter should select one of multiple
similar cases. This one seems legit, because they are very similar ;) It
says "In case of $count look like X do this, or $count look like Y do that,
or $count look like Z do something else (and so on)". For such I find the
if-elseif-elseif-elseif-elseif-else-construction quite confusing.
Beside this it can be rewritten as
switch ((int) (($count-1) / 7) {
case 0: // 1-7
case 1: // 8 - 14
default: // above 15
}
Regards,
Sebastian
>
> --
> Cheers -- Tim
>
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
--
github.com/KingCrunch
--- End Message ---
--- Begin Message ---
On 11/16/2012 12:38 PM, Tim Streater wrote:
On 16 Nov 2012 at 12:10, Omar Muhsin <mrfroa...@gmail.com> wrote:
Hello,
I was just wondering after writting the code in version 2 here below, it turns
out in testing that it actually PHP is not validating the expressions instead
always I get the first case.
1.Using nested if statement {THE INTENDED BEHAVIOR}:
if ($count > 14)
$boxes = 3;
elseif($count > 7 && $count <= 14)
You don't need the count<=14 part as you will *only* get there if $count<=14.
$boxes = 2;
else
$boxes = 1;
2. Using Switch {ALWAYS FIRST CASE!!!}
// $boxes = 1;
// switch ($count) {
// case ($count > 14):
// $boxes = 3;
// break;
// case ($count > 7 && $count <= 14):
// $boxes = 2;
// break;
// case ($count <= 7):
// default :
// $boxes = 1;
// break;
// }
Does anyone know the answer why using the Switch it always execute the first
case ?
As has been pointed out you need switch(true).
That's a strange way of writing a switch, IMO. You should be using the if
version.
--
Cheers -- Tim
Maybe I'm way out of touch, but when I look at php.net for the syntax of
the switch statement I see:
switch($var){
case (value):
(do something)
case (other value):
(do something else)
}
IN your example, you are using a switch syntax that is nothing like
that. I think that your "case " statements are not actually evaluating
the value of $count, but are themselves evaluating to a true value that
has nothing to do with $count.
Here's the manual reference:
http://us.php.net/manual/en/control-structures.switch.php
--- End Message ---
