Reload (refresh) page within an if statement

Hi all,

Is there a simple way in php to reload a page coded within an if
statement.(see code below)
It's very important that the session stays intact.
The filename is RCStudent.php

**************** A peace of code***************************
<?php
session_start();
?>

if($_POST['ST']!='')
{
$_SESSION['nScreen']=2'';
}
elseif ($_POST['AT']!='')
{
$_SESSION['nScreen']=0'';

*** RELOAD CODE HERE ***
}

******************* End code*******************************

T.i.a.

Regards,

Tino Wintershoven.
The Netherlands.

"T. Wintershoven" <twintershoven@casema.nlwrote in message
news:raqdnVvftoLyvfHYnZ2dnUVZ8tSdnZ2d@casema.nl...

Quote:

Hi all,
>
Is there a simple way in php to reload a page coded within an if
statement.(see code below)
It's very important that the session stays intact.
The filename is RCStudent.php
>
**************** A peace of code***************************
<?php
session_start();
?>
>
if($_POST['ST']!='')
{
$_SESSION['nScreen']=2'';
}
elseif ($_POST['AT']!='')
{
$_SESSION['nScreen']=0'';
>
*** RELOAD CODE HERE ***
}
>
******************* End code*******************************

Do a header("Location: this_page_with_appropiate_parameter_passing"); ?

Shelly

Hi Shelly,

Thanks for your reaction.

When i do a header(location), i get an error message:
Warning: Cannot modify header information - headers already sent.

The header is allready sent on the second line ... session_start() ... (see
code)

Tino

"Shelly" <sheldonlg.news@asap-consult.comwrote in message
news:9AVah.4038$sf5.623@newsread4.news.pas.earthli nk.net...

Quote:

"T. Wintershoven" <twintershoven@casema.nlwrote in message
news:raqdnVvftoLyvfHYnZ2dnUVZ8tSdnZ2d@casema.nl...

Quote:

Hi all,

Is there a simple way in php to reload a page coded within an if
statement.(see code below)
It's very important that the session stays intact.
The filename is RCStudent.php

**************** A peace of code***************************
<?php
session_start();
?>

if($_POST['ST']!='')
{
$_SESSION['nScreen']=2'';
}
elseif ($_POST['AT']!='')
{
$_SESSION['nScreen']=0'';

*** RELOAD CODE HERE ***
}

******************* End code*******************************

>
Do a header("Location: this_page_with_appropiate_parameter_passing"); ?
>
Shelly
>
>

Not sure exactly what kind of "reload" you are talking about?
I assume you mean the client's browser should reload at specific times:

PHP can't reload a site, the browser does a reload if instructed to,
therefore you need to tell the client's browser to reload the page, just
add:

<META HTTP-EQUIV=REFRESH CONTENT="10; URL=RCStudent.php">

to your html head. Here the page is reloaded every 10 seconds

PHP can redirect with header location like someone else just mentioned.
And a redirect works only if you haven't echoed any html before doing a:

header("Location: ....);

T. Wintershoven schrieb:

Quote:

Hi all,
>
Is there a simple way in php to reload a page coded within an if
statement.(see code below)
It's very important that the session stays intact.
The filename is RCStudent.php
>
**************** A peace of code***************************
<?php
session_start();
?>
>
if($_POST['ST']!='')
{
$_SESSION['nScreen']=2'';
}
elseif ($_POST['AT']!='')
{
$_SESSION['nScreen']=0'';
>
*** RELOAD CODE HERE ***
}
>
******************* End code*******************************
>
T.i.a.
>
Regards,
>
Tino Wintershoven.
The Netherlands.
>
>

You can't send a Location header after sending cookies (which
session_start() does).

So you either need to find a way to reload without starting a session,
or you need to print a <metarefresh tag into the page to reload it...

T. Wintershoven schrieb:

Quote:

Hi Shelly,
>
Thanks for your reaction.
>
When i do a header(location), i get an error message:
Warning: Cannot modify header information - headers already sent.
>
The header is allready sent on the second line ... session_start() ... (see
code)
>
Tino
>
>
>
"Shelly" <sheldonlg.news@asap-consult.comwrote in message
news:9AVah.4038$sf5.623@newsread4.news.pas.earthli nk.net...
>

Quote:

>>"T. Wintershoven" <twintershoven@casema.nlwrote in message
>>news:raqdnVvftoLyvfHYnZ2dnUVZ8tSdnZ2d@casema.nl. ..
>>

Quote:

>>>Hi all,
>>>
>>>Is there a simple way in php to reload a page coded within an if
>>>statement.(see code below)
>>>It's very important that the session stays intact.
>>>The filename is RCStudent.php
>>>
>>>**************** A peace of code***************************
>>><?php
>> session_start();
>>>?>
>>>
>>>if($_POST['ST']!='')
>>>{
>> $_SESSION['nScreen']=2'';
>>>}
>>>elseif ($_POST['AT']!='')
>>>{
>> $_SESSION['nScreen']=0'';
>>>
>> *** RELOAD CODE HERE ***
>>>}
>>>
>>>******************* End code*******************************

>>
>>Do a header("Location: this_page_with_appropiate_parameter_passing"); ?
>>
>>Shelly
>>
>>

>
>
>

--
CB

Christoph Burschka wrote:

Quote:

You can't send a Location header after sending cookies (which
session_start() does).
>
So you either need to find a way to reload without starting a session,
or you need to print a <metarefresh tag into the page to reload it...

Or you buffer the output by calling ob_start() at the start of the script.
:-)

Regards,
Erwin Moller

Quote:

>
>
T. Wintershoven schrieb:

Quote:

>Hi Shelly,
>>
>Thanks for your reaction.
>>
>When i do a header(location), i get an error message:
>Warning: Cannot modify header information - headers already sent.
>>
>The header is allready sent on the second line ... session_start() ...
>(see code)
>>
>Tino
>>
>>
>>
>"Shelly" <sheldonlg.news@asap-consult.comwrote in message
>news:9AVah.4038$sf5.623@newsread4.news.pas.earthl ink.net...
>>

Quote:

>>>"T. Wintershoven" <twintershoven@casema.nlwrote in message
>>>news:raqdnVvftoLyvfHYnZ2dnUVZ8tSdnZ2d@casema.nl ...
>>>
>>>>Hi all,
>>>>
>>>>Is there a simple way in php to reload a page coded within an if
>>>>statement.(see code below)
>>>>It's very important that the session stays intact.
>>>>The filename is RCStudent.php
>>>>
>>>>**************** A peace of code***************************
>>>><?php
>>> session_start();
>>>>?>
>>>>
>>>>if($_POST['ST']!='')
>>>>{
>>> $_SESSION['nScreen']=2'';
>>>>}
>>>>elseif ($_POST['AT']!='')
>>>>{
>>> $_SESSION['nScreen']=0'';
>>>>
>>> *** RELOAD CODE HERE ***
>>>>}
>>>>
>>>>******************* End code*******************************
>>>
>>>Do a header("Location: this_page_with_appropiate_parameter_passing"); ?
>>>
>>>Shelly
>>>
>>>

>>
>>
>>

>
--
CB

"Christoph Burschka" <christoph.burschka@rwth-aachen.dewrote in message
news:4t2u5rF126odiU1@mid.dfncis.de...

Quote:

You can't send a Location header after sending cookies (which
session_start() does).
>
So you either need to find a way to reload without starting a session, or
you need to print a <metarefresh tag into the page to reload it...

Um, you sure about that?
The code below works fine here:

<?php
session_start();

if (! isset($_GET['refresh'])) {
setcookie('foo','Bar');
$_SESSION['foo'] = 'Bar';
header('Location:'.$_SERVER['PHP_SELF'].'?refresh=1');
} else {
echo 'page refreshed';
echo '<br />Session foo: '.$_SESSION['foo'];
echo '<br />Cookie foo: '.$_COOKIE['foo'];
}
?>

maybe the OP is outputting something (whitespace etc) prior to the
redirection?

cheers
ED

ED wrote:

Quote:

"Christoph Burschka" <christoph.burschka@rwth-aachen.dewrote in message
news:4t2u5rF126odiU1@mid.dfncis.de...

Quote:

>You can't send a Location header after sending cookies (which
>session_start() does).
>>
>So you either need to find a way to reload without starting a session, or
>you need to print a <metarefresh tag into the page to reload it...

>
Um, you sure about that?
The code below works fine here:
>

[...]

Quote:

>

Then I remember it wrong...

Oh, right: What you can't send after a cookie is the HTTP response code - such
as "HTTP/1.1 303 See Other". The status code apparently has to be the first
header sent, while the Location header can follow after the cookies just fine.

I've never used a Location header without explicitly setting a 3xx response yet,
so that's the reason for the mix-up.

--
Christoph Burschka

You most definitely cannot use Header once you have output something to
the screen. I have had to battle that one a few times. It all depends
on where the php code is put in your page. If it has to be after
something is output (<bodytag) why not use JavaScript? If before
<bodyuse <meta>.

Christoph Burschka wrote:

Quote:

ED wrote:

Quote:

"Christoph Burschka" <christoph.burschka@rwth-aachen.dewrote in message
news:4t2u5rF126odiU1@mid.dfncis.de...

Quote:

You can't send a Location header after sending cookies (which
session_start() does).
>
So you either need to find a way to reload without starting a session, or
you need to print a <metarefresh tag into the page to reload it...

Um, you sure about that?
The code below works fine here:

[...]

Quote:

>
>
Then I remember it wrong...
>
Oh, right: What you can't send after a cookie is the HTTP response code - such
as "HTTP/1.1 303 See Other". The status code apparently has to be the first
header sent, while the Location header can follow after the cookies just fine.
>
I've never used a Location header without explicitly setting a 3xx response yet,
so that's the reason for the mix-up.
>
--
Christoph Burschka

Reload (refresh) page within an if statement

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