Passing/reading variables

Abarak

Hello,

I am currently having problems passing variables from a form to the same/different page.....

If you point your browser to www.inuke.d2g.com/test.php you should notice selecting the button will redirect you to test2.php however it will not display $Action.

Also, the same thing happens with GET or POST and I am using the div .ini file.

Any assistance you could provide would be most helpful!

Abarak

Partyman

I have just started experimenting with sessions and I am getting the same problem. I have 4 books on PHP and typing in all the examples gives me the same problem. Also examples on supplied CD do not work. I just cannot display a variable from any page other than the page it was created in!

This seems to me that it should be some form of configuration problem but I have no idea what it is. I cannot proceed with PHP until this has been sorted because it is central to what I wish to do with PHP.

Anyone with an answer or pointer to where to look will get my eternal admiration!!

fleshbox

It looks like your problem isn't with the php or the p[assing of variables, try using a form field instead of a javascript to fill in the value, and it should work. I would think that there is some type of problem with the javascript adding a value... Im not really versed with js so I couldn't really be positive about it... but your form looks good....

I assume that test2.php is simply an

echo $Action;

correct?

I would try this code

Stat =

<form action="test2.php">
<input type="text" name="Action">
<input type="submit" value="Click Here">
</form>

and for test2.php
echo $Action

I dont know if that helps your specific situation, but it should work...

fleshbox

I am having a similar problem on a site Im working on, I need to pass an array through an anchor. simply adding

?margin_data=$margin_data

to the end of the HREF doesn't work, it simply passes the value "Array" rather than the data inside the array. I dont want to have to write a

foreach ($margin_data as $x) echo $x, ;

inside the anchor tag, and then have to re-build the array on the next page because this just seems like a really sloppy way to do it... I know there has to be a way to do it...

I basically need to pass a variable about of data through an array variable. the data includes image id numbers that correspond to images on that right hand margin that are selected randomly through a MYsql query in a separate function. I need to retain these id numbers on specific hyperlinks so that I can limit the page from changing those images so as not to draw the eye away from the intended effect... if anyone has an idea... that would be helpful...

[edit]
nevermind I found something that will work....
implode and explode...

implode the variable to a comma separated value, pass the variable through the url, then explode the comma separated value back into an array variable...

$csv = implode(",",$margin_data);
a href='?page_id=6&csv=$csv'

and on page_id 6

$margin_data = explode(",",$csv);

irish

Originally posted by Abarak
If you point your browser to www.inuke.d2g.com/test.php you should notice selecting the button will redirect you to test2.php however it will not display $Action.

Also, the same thing happens with GET or POST and I am using the div .ini file.

Based on my own testing, I would say that your PHP setup has register_globals set to "off" which means that when you pass variables using POST or GET, you need to call those variable in their standard global arrays.

In your case, to get at that value, you would need to do something like:

print $_GET["Action"];

I would guess that you were trying to do something like this:

print $Action;

Now, before you get annoyed by this and go and turn register_globals "on", be aware that it is a security feature to have this data sealed off in its own array.

irish

Originally posted by Partyman
I have just started experimenting with sessions and I am getting the same problem. I have 4 books on PHP and typing in all the examples gives me the same problem. Also examples on supplied CD do not work. I just cannot display a variable from any page other than the page it was created in!

This seems to me that it should be some form of configuration problem but I have no idea what it is. I cannot proceed with PHP until this has been sorted because it is central to what I wish to do with PHP.

Anyone with an answer or pointer to where to look will get my eternal admiration!!

In your case, you need to be sure that you are passing the data between pages properly. Most commonly it is by posting the data from a form to a PHP processing script, or by passing GET vars in URLs like so:

<a href="somepage.php?var=value">

then, on sompage.php, you can have part of your script looking for that value:

<?php

if ($_GET["var"] == "value")
{
   /* do something special */
}
else
{
  /* do something else */
}

?>

you just need to remember that the default PHP setting for register_globals is "off" in versions > 4.2. You can test this by having a simple page that includes only this:

<?php phpinfo(); ?>

load that page in your browser, and you will find many if not all answers to questions that depend on the configuration of PHP.

irish

Originally posted by fleshbox
nevermind I found something that will work....
implode and explode...

Similarly, you could serialize the data, like so:

Sending Page:
<?php
$packed = serialize($margin_data);
/* <a href="link.php?margin=$packed"> */
?>
Receiving Page:
<?php
$margin_data = unserialize($_GET["margin"]);
?>

EDIT:
Ok, thats a bad way to send the data via GET. you would find that more suitable when packing an array for storage in a DB or cookie. Sorry, but useful info none the less.

Abarak

Thanks for all your help, especially Irish!

Irish was correct and using $GET["Action"]; or $POST["Action"]; did resolve this particular issue. However, I would be interested to know if I need to do anything different while using sessions since I am just now starting to use them and I must admit, a bit unfamiliar with them.

Again, thanks for the help!

Abarak