Break current script, but run next

[Sandman]

Ok, so I have PHP set upp to ato_prepend and auto_append files to every script
I run. So if I someone surfs to /index.php, these scripts run:

init.php -> set up DB connections and stuff. Buffers output
index.php -> The current page with it's layout, output is buffered.
postprocess.php -> Fetches buffer, applies layout to page.


Now, sometimes I want to break the execution of index.php (or whatever page
that is in the middle). For example, when someone submits a form with
insufficient data, I want to quit executing code and just put up an alert. But
if I use "die;", then PHP will stop executing all code, it won't just stop
executing the code in index.php.

Is there a way to tell PHP to stop executing code in the current script, but
continue with the next? I would guess that the same could apply to include()'d
files, where I want the execution of the included file to stop, but the page
that included the file shouldn't stop executing. I.e.:

<?
print "Hello ";
include("world. php");
print "!";
?>

And "world.php" would in this case just output "World", but by using some
method, I could just break the execution of world.php from within world.php
(without using large IF blocks) and the result would then be "Hello !" from the
page, and not "Hello " which happens if I use "die;" in world.php.

Any suggestions?

--
Sandman[.net]

[Pieter Nobes]

Re: Break current script, but run next

Sandman wrote:[color=blue]
> Any suggestions?[/color]

Perhaps you could use something like:

<?php
while (true) {
// ...
if ( NOT_ALL_FIELS_C ORRECT ) {
$message = ERRORMSG;
break;
}
// Rest of code
break; // Don't forget this or you're thrown in an infinite loop
}
?>

--
Pieter Nobels

[Sandman]

Re: Break current script, but run next

In article <jH_Uc.218808$j F5.10775687@pho bos.telenet-ops.be>,
Pieter Nobes <pieterRE@MOVE. opengate.be> wrote:
[color=blue]
> Sandman wrote:[color=green]
> > Any suggestions?[/color]
>
> Perhaps you could use something like:
>
> <?php
> while (true) {
> // ...
> if ( NOT_ALL_FIELS_C ORRECT ) {
> $message = ERRORMSG;
> break;
> }
> // Rest of code
> break; // Don't forget this or you're thrown in an infinite loop
> }
> ?>[/color]

I don't get it. How do I apply this to my files? In which file do I add this? I
would very much prefer not to have index.php (in this case) be something like:


if (condition){
(alert of error and break script
} else {
huge block of application, several K's big that would ordinarely be executed
}

--
Sandman[.net]

[Pieter Nobes]

Re: Break current script, but run next

Sandman wrote:[color=blue]
> In article <jH_Uc.218808$j F5.10775687@pho bos.telenet-ops.be>,
> Pieter Nobes <pieterRE@MOVE. opengate.be> wrote:
>
>[color=green]
>>Sandman wrote:
>>[color=darkred]
>>>Any suggestions?[/color]
>>
>>Perhaps you could use something like:
>> ...[/color]
>
>
> I don't get it. How do I apply this to my files? In which file do I add this? I
> would very much prefer not to have index.php (in this case) be something like:[/color]
You use it in all your pages. You start a while loop (just an example,
first possible way I could think of), and when something goes wrong, you
/break out/ out the wile loop, and the other script (postproccess.p hp)
will be executed (since that code isn't in the while loop). Process:

load page
include init.php
execute init.php
go into while loop
check wether $_GET['name'] is empty
$_GET['name'] is empty, break out of while loop[color=blue][color=green][color=darkred]
>>>> the rest of the code in the while loop isn't executed, since we[/color][/color][/color]
broke out
include postprocess.php
execute postprocess.php
[color=blue]
> if (condition){
> (alert of error and break script
> } else {
> huge block of application, several K's big that would ordinarely be executed
> }[/color]

Why don't you want this? You *have* to say *somewhere* what the
interpreter has to in which conditions. This seems like a very good and
fast solution (beter than the while loop ;-) )

--
Pieter Nobels

[Sandman]

Re: Break current script, but run next

In article <ES%Uc.218869$_ I5.10806365@pho bos.telenet-ops.be>,
Pieter Nobes <pieterRE@MOVE. opengate.be> wrote:
[color=blue]
> Sandman wrote:[color=green]
> > In article <jH_Uc.218808$j F5.10775687@pho bos.telenet-ops.be>,
> > Pieter Nobes <pieterRE@MOVE. opengate.be> wrote:
> >
> >[color=darkred]
> >>Sandman wrote:
> >>
> >>>Any suggestions?
> >>
> >>Perhaps you could use something like:
> >> ...[/color]
> >
> >
> > I don't get it. How do I apply this to my files? In which file do I add
> > this? I
> > would very much prefer not to have index.php (in this case) be something
> > like:[/color]
> You use it in all your pages. You start a while loop (just an example,
> first possible way I could think of), and when something goes wrong, you
> /break out/ out the wile loop, and the other script (postproccess.p hp)
> will be executed (since that code isn't in the while loop). Process:
>
> load page
> include init.php
> execute init.php
> go into while loop
> check wether $_GET['name'] is empty
> $_GET['name'] is empty, break out of while loop[color=green][color=darkred]
> >>>> the rest of the code in the while loop isn't executed, since we[/color][/color]
> broke out
> include postprocess.php
> execute postprocess.php
>[color=green]
> > if (condition){
> > (alert of error and break script
> > } else {
> > huge block of application, several K's big that would ordinarely be
> > executed
> > }[/color]
>
> Why don't you want this? You *have* to say *somewhere* what the
> interpreter has to in which conditions. This seems like a very good and
> fast solution (beter than the while loop ;-) )[/color]

Ok, before I set up and start trying this, are you saying that I could initiate
the loop in init.php and end it in postprocess.php ? Like this:

init.php
print "Hello";
while (true){

index.php
if (!$_GET["name"]) break
print "Index";

postprocess.php
break;
}
print "World!";


So if the IF in index.php fails, will it only print "HelloWorld !"? What if I
have a loop in index.php and want to break from that? That is, if you can even
set a loop to span several scripts...

I am using the apache option php_append_file and php_prepend_fil e to include
init.php and postprocess.php to all scripts.

--
Sandman[.net]

[Pieter Nobes]

Re: Break current script, but run next

Sandman wrote:[color=blue]
> So if the IF in index.php fails, will it only print "HelloWorld !"? What if I
> have a loop in index.php and want to break from that? That is, if you can even
> set a loop to span several scripts...[/color]

No, that's not possible. You'd have to do it in every script. I think
this solution is better because if you'd use if/else you'd have almost
*no* space left because of indenting... i.e.:

<?php
if (empty($var1)) break;
else {
// do some things
if ($connection == false) break;
else {
// do some things
if ($numrows = 0) break;
else {
// ...
}
}
}
?>

which would, in the end, become *VERY* unclear.

--
Pieter Nobels

[Jonathan Epps]

Re: Break current script, but run next

Pieter Nobes wrote:[color=blue]
> Sandman wrote:
>[color=green]
>> Any suggestions?[/color]
>
>
> Perhaps you could use something like:
>
> <?php
> while (true) {
> // ...
> if ( NOT_ALL_FIELS_C ORRECT ) {
> $message = ERRORMSG;
> break;
> }
> // Rest of code
> break; // Don't forget this or you're thrown in an infinite loop
> }
> ?>
>[/color]

The manual available at php.net uses a do-while loop to do the same
thing, except that with a do-while loop, you don't have to worry about
infinite loops if you use do { // ... } while(0);

<?php
do {
// ...
if ( BOZO_CANNOT_FIL L_OUT_FORMS_COR RECTLY ) {
$message = ERRORMSG;
break;
}
// ...
} while (0);
?>

Here's the part of the php.net manual I'm talking about:

http://www.php.net/manual/en/control-structures.do.while.php