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Posted by Colin McKinnon on 06/22/06 22:17
maya wrote:
> yes I know, this has been asked many times, but I don't quite the
> answers: usu. answers are to put the redirect code -- in my case
>
> $URL =
> "out.php?msg=selected+records+have+been+deleted+from+the+database.";
> header("Location: $URL");
>
> BEFORE any HTML output (does this include 'echo' output's?)
>
Yes - everything outside of <?php ... ?> and every print and echo inside.
> but: if, like in my case, for example, I delete data (passed in req)
> from db
So how does that cause output to the browser?
> THEN I redirect pg back to referer, how can I put redirect code
> BEFORE anything else?
Using a POST/GET redirection pattern is messy even when you know what you
are doing. And if you knew what you were doing you wouldn't use
header("Location:...") for the redirection like that. It may have become
standard practice for HTTP/1.0 but just plain wrong for HTTP/1.1. Have a
google for discussion on the topic.
> <html><head>css.. etc.. </head><body>
> php: do db stuff... then:
> mysql_close($conn);
> echo "<br><br><b>connection to db closed.</b><br><br><br>\n\n";
> $URL =
> "out.php?msg=selected+records+have+been+deleted+from+the+database.";
> header("Location: $URL"); ?>
> </body>
> </html>
>
Try doing the php stuff before you do <html>. You can work around it by
using output buffering but you're just digging a bigger hole for yourself
if you do by making your code more complex and jumbled than it needs to be.
> (this is not a serious problem since can do with JavaScript, but just
> wondering what the deal is here... in Java you do redirect with RESPONSE
> object,
php != java
php != asp
php != perl
php != ecmascript
php != Visual BASIC
If you want to write a framework of objects so it behaves similarly - then
do so - its quite possible. You can even recreate those fun null reference
errors (memory leaks, application server recycles, and horrendous build /
deployment cycles are much harder to emulate though).
Or a better idea might be to go find a templating system.
C.
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