Execute php with back button

[zek2005]

Hi!!!!

I need that when the user goes back to the last page with the "Back"
button of the browser, the page executes the php code again.

Is there any code to insert in php that implies a reload every time the
page appears in the user browser??

Best regards!!!

Ezequiel

[Lüpher Cypher]

Re: Execute php with back button

zek2005 wrote:[color=blue]
> I need that when the user goes back to the last page with the "Back"
> button of the browser, the page executes the php code again.
>
> Is there any code to insert in php that implies a reload every time the
> page appears in the user browser??
>[/color]


Simply disable caching:

<?php

header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires : Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past

session_start() ;
if (!session_regis ter("var")) {
session_registe r("var");
$_SESSION["var"] = 1;
} else {
$_SESSION["var"]++;
}

echo $_SESSION["var"];

?>

This will output 1 on first load,
Go to some other site, then hit back, and it will output 2 :)


luph

[Balazs Wellisch]

Re: Execute php with back button

You could also try:

<form action="<?php print $_SERVER['HTTP_REFERER']; ?>" method="get">
<input type="submit" value="back">
</form>

Of course if the page was the result of a post than the method would have to
be changed accordingly.

Balazs
[color=blue]
>
> Is there any code to insert in php that implies a reload every time the
> page appears in the user browser??
>[/color]

[Tim Roberts]

Re: Execute php with back button

Lüpher Cypher <lupher.cypher@ verizon.net> wrote:[color=blue]
>
>Simply disable caching:
>
><?php
>
>header("Cach e-Control: no-cache, must-revalidate"); // HTTP/1.1
>header("Expire s: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past[/color]

I've seen a number of different suggestions on disabling caching over the
years, with variations that worked some places but not in others.

Is this now the "canonical" recommended method of disabling caching of a
web page? Does this really catch all the major browsers and proxies,
including AOL's rather aggressive "accelerato r"?
--
- Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

[Lüpher Cypher]

Re: Execute php with back button

Tim Roberts wrote:[color=blue][color=green]
>> <?php
>>
>> header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
>> header("Expires : Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past[/color]
>
> I've seen a number of different suggestions on disabling caching over the
> years, with variations that worked some places but not in others.
>
> Is this now the "canonical" recommended method of disabling caching of a
> web page? Does this really catch all the major browsers and proxies,
> including AOL's rather aggressive "accelerato r"?[/color]

Well, I'm not sure, as I haven't tested it on all browsers, but it
should work fine since it is a http1.1 standard ;)


luph