Re: [PHP] alter switch variable inside case?
Actually, you can--just don't "break;".
Try it.
- E
I'd like to be able to modify the switch variable inside a case
statement, like this:
switch ($foo) {
case 'step2':
do_step2();
if ($error) $foo='step1'; //repeat step1
break;
case 'step1':
do_step1();
break;
case 'a_third_thing':
do_something_else();
break;
}
Can you modify the variable ($foo) inside a case statement and
have it evaluated for subsequent 'case's like this? If not, I
will have to revert to a series of if statements, in which this can
be done:
if ($foo=='step2') {
do_step2();
if ($error) $foo='step1';
}
if ($foo=='step1') {
do_step1();
}
etc.
Switch-case seems cleaner, and I'd prefer to stick with it.
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Re: [PHP] alter switch variable inside case?
If you don't break, it continues to execute all the code until
the end of the switch, ignoring any subsequent case
statements.
In my example, eliminating the break after step2 would
cause execution of do_step1(), but also do_something_else(),
which is not desired.
--- @ Edwin [EMAIL PROTECTED] wrote:
Actually, you can--just don't break;.
Try it.
- E
I'd like to be able to modify the switch variable inside a case
statement, like this:
switch ($foo) {
case 'step2':
do_step2();
if ($error) $foo='step1'; //repeat step1
break;
case 'step1':
do_step1();
break;
case 'a_third_thing':
do_something_else();
break;
}
Can you modify the variable ($foo) inside a case statement and
have it evaluated for subsequent 'case's like this? If not, I
will have to revert to a series of if statements, in which this can
be done:
if ($foo=='step2') {
do_step2();
if ($error) $foo='step1';
}
if ($foo=='step1') {
do_step1();
}
etc.
Switch-case seems cleaner, and I'd prefer to stick with it.
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Re: [PHP] alter switch variable inside case?
Well, you don't have to take away all the "break;". :)
For example, only here:
switch ($foo) {
case 'step2':
do_step2();
if ($error) $foo='step1'; //repeat step1
break;
- E
If you don't break, it continues to execute all the code until
the end of the switch, ignoring any subsequent case
statements.
In my example, eliminating the break after step2 would
cause execution of do_step1(), but also do_something_else(),
which is not desired.
--- "@ Edwin" [EMAIL PROTECTED] wrote:
Actually, you can--just don't "break;".
Try it.
- E
I'd like to be able to modify the switch variable inside a case
statement, like this:
switch ($foo) {
case 'step2':
do_step2();
if ($error) $foo='step1'; //repeat step1
break;
case 'step1':
do_step1();
break;
case 'a_third_thing':
do_something_else();
break;
}
Can you modify the variable ($foo) inside a case statement and
have it evaluated for subsequent 'case's like this? If not, I
will have to revert to a series of if statements, in which this can
be done:
if ($foo=='step2') {
do_step2();
if ($error) $foo='step1';
}
if ($foo=='step1') {
do_step1();
}
etc.
Switch-case seems cleaner, and I'd prefer to stick with it.
__
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Re: [PHP] alter switch variable inside case?
Regardless of how many break statements you take away (even
if only 1), case statements appear to be ignored after the
first match is made. I need a way to make the switch statement
continue evaluating case-matches, even after the first case
match is made. Further, it should allow one case segment to
alter the switch variable and have such alteration taken
into account for subsequent matches.
Here's a more illustrative example of my situation:
switch ($foo) {
case 'a':
if (do_a()) echo a was done;
else $foo='menu';
break;
case 'b':
if (do_b()) echo b was done;
else $foo='menu';
break;
case 'menu':
print_menu();
break;
case 'logout':
do_logout();
break;
}
that code will not print_menu if do_a fails, since
it exits the switch statement upon seeing a break.
if I remove the break after do_a, it will execute
do_a and do_b -- bad. what we really want is for it
to execute do_a and if do_a returns false, print_menu.
Joe
--- @ Edwin [EMAIL PROTECTED] wrote:
Well, you don't have to take away all the break;. :)
For example, only here:
switch ($foo) {
case 'step2':
do_step2();
if ($error) $foo='step1'; //repeat step1
break;
- E
If you don't break, it continues to execute all the code until
the end of the switch, ignoring any subsequent case
statements.
In my example, eliminating the break after step2 would
cause execution of do_step1(), but also do_something_else(),
which is not desired.
--- @ Edwin [EMAIL PROTECTED] wrote:
Actually, you can--just don't break;.
Try it.
- E
I'd like to be able to modify the switch variable inside a case
statement, like this:
switch ($foo) {
case 'step2':
do_step2();
if ($error) $foo='step1'; //repeat step1
break;
case 'step1':
do_step1();
break;
case 'a_third_thing':
do_something_else();
break;
}
Can you modify the variable ($foo) inside a case statement and
have it evaluated for subsequent 'case's like this? If not, I
will have to revert to a series of if statements, in which this can
be done:
if ($foo=='step2') {
do_step2();
if ($error) $foo='step1';
}
if ($foo=='step1') {
do_step1();
}
etc.
Switch-case seems cleaner, and I'd prefer to stick with it.
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Re: [PHP] alter switch variable inside case?
It seems like you can do something like this:
switch ($foo) {
case 'a':
if (do_a()) echo "a was done";
else print_menu(); // changes here
break;
case 'b':
if (do_b()) echo "b was done";
else print_menu(); // changes here
break;
case 'menu':
print_menu();
break;
case 'logout':
do_logout();
break;
}
Or, if for some reason you can't do that (or you don't want to)...
Here's another way: (I'm not sure if this will work.)
switch ($foo) {
case 'a':
if (do_a()) echo "a was done";
else $foo='menu';
case 'menu':
print_menu();
break;
case 'b':
if (do_b()) echo "b was done";
else $foo='menu';
case 'menu':
print_menu();
break;
case 'logout':
do_logout();
break;
}
It doesn't look "clean" but it might just work...
BTW, I know this is just an example, but I expect you're doing your
if(){
} else {
}
properly in your real code...
- E
Regardless of how many break statements you take away (even
if only 1), case statements appear to be ignored after the
first match is made. I need a way to make the switch statement
continue evaluating case-matches, even after the first case
match is made. Further, it should allow one case segment to
alter the switch variable and have such alteration taken
into account for subsequent matches.
Here's a more illustrative example of my situation:
switch ($foo) {
case 'a':
if (do_a()) echo "a was done";
else $foo='menu';
break;
case 'b':
if (do_b()) echo "b was done";
else $foo='menu';
break;
case 'menu':
print_menu();
break;
case 'logout':
do_logout();
break;
}
that code will not print_menu if do_a fails, since
it exits the switch statement upon seeing a break.
if I remove the break after do_a, it will execute
do_a and do_b -- bad. what we really want is for it
to execute do_a and if do_a returns false, print_menu.
Joe
--- "@ Edwin" [EMAIL PROTECTED] wrote:
Well, you don't have to take away all the "break;". :)
For example, only here:
switch ($foo) {
case 'step2':
do_step2();
if ($error) $foo='step1'; //repeat step1
break;
- E
If you don't break, it continues to execute all the code until
the end of the switch, ignoring any subsequent case
statements.
In my example, eliminating the break after step2 would
cause execution of do_step1(), but also do_something_else(),
which is not desired.
--- "@ Edwin" [EMAIL PROTECTED] wrote:
Actually, you can--just don't "break;".
Try it.
- E
I'd like to be able to modify the switch variable inside a case
statement, like this:
switch ($foo) {
case 'step2':
do_step2();
if ($error) $foo='step1'; //repeat step1
break;
case 'step1':
do_step1();
break;
case 'a_third_thing':
do_something_else();
break;
}
Can you modify the variable ($foo) inside a case statement and
have it evaluated for subsequent 'case's like this? If not, I
will have to revert to a series of if statements, in which this
can
be done:
if ($foo=='step2') {
do_step2();
if ($error) $foo='step1';
}
if ($foo=='step1') {
do_step1();
}
etc.
Switch-case seems cleaner, and I'd prefer to stick with it.
__
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