[PHP] alter switch variable inside case?
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?
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] Re: alter switch variable inside case?
Could you elaborate?
In the example I posted, setting
foo=step1 in the first case segment does NOT cause
execution of the second case segment, as would be the
case if it was actually re-evaluating the match upon
subsequent case statements.
--- CHAILLAN Nicolas [EMAIL PROTECTED] wrote:
Yes you can.
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Joe Janitor [EMAIL PROTECTED] a écrit dans le message de news:
[EMAIL PROTECTED]
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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