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Global variables in HTML how to set them

I want to be able to refer to global variables, throughout my webpages.

I have set some variables and I can't read read them even in the page I set them, see the code, so I believe that I have not set the globals correctly if someone could check for me please.


When I searched EE for a solution there was lots of comments about the badness of global variables.

I also tried setting $_POST variables and that wasn't successful either.

Can someone help

Thank you for reading this

John
$role=$acct->getUserRole($_POST['fusername']);
        $user_ID=$acct->getUser_ID('fusername');
        $GLOBALS['user_ID_loggedin']=$user_ID;
        $GLOBALS['user_name_logged']=$_POST['fusername'];
        $GLOBALS['user_role']=$role;
        foreach ($GLOBALS as $key => $value)
        {
            echo htmlspecialchars('$key : $value');
            echo "<br>";
        }
        //header("Location: SecretPage.php");
        //exit();

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image.docx
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johnecollins
Asked:
johnecollins
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3 Solutions
 
Ray PaseurCommented:
Buy this book.   It will get you a good foundation in how PHP works.
http://www.sitepoint.com/books/phpmysql4/

My guess is that you want to use the PHP session.  It lets you carry variables from one page to the next.
http://php.net/manual/en/function.session-start.php
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Ray PaseurCommented:
From the variable names posted here it looks like you may be trying to do client authentication in PHP.  If so, this article will show you the design pattern.
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_2391-PHP-login-logout-and-easy-access-control.html
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Dave BaldwinFixer of ProblemsCommented:
There are two primary methods of storage (that Ray referred to above) available to you.  The first is $_SESSION variables which apply to a particular session and user.  They expire after a short time of inactivity.  The second is databases like MySQL which don't expire.  You would have to include some id info to find data for a particular user.

All other data and variables disappear when the PHP script finishes.  The only thing left is what you sent to the browser.
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johnecollinsAuthor Commented:
Hi Ray,

Thanks for the swift answers, I meant to contact you because I already have that bokk and have read most of it. I will consult it again and and the other two sites. As I was struggling with the things I was doing I enrolled on two courses on the sitepoint site the getting started with CSS and javascript programming for the web. I am feeling the benefit for them and it's solved a few problems for me and I'll be charging upwards and onwards ;-)

If I ever make it to America I'd be very pleased to come and shake your hand and thank you for all the help you have given me.

Cheers for now

John
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johnecollinsAuthor Commented:
Thank you both for your help and the quick response

John
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Dave BaldwinFixer of ProblemsCommented:
You're welcome, glad to help.
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Ray PaseurCommented:
Thanks for your kind words, John.  In addition to what DaveBaldwin said, there is another way to pass information from one request to the next (in HTTP parlance, a page load is a "request") and that is to use cookies.  In fact the session handler uses cookies to carry a pointer.  The pointer lets each script find the values in the session array.

It works something like this:

session_start();
$_SESSION["dogName"] = "Fido";

Now the value in $_SESSION["dogName"] will be available to other scripts.

Couple of notes.  Session_start() must be called first before there is any browser output at all, even invisible whitespace.  A good way to ensure that catastrophe is not left to chance is to put the session_start() into some kind of conditional structure, like an if() statement.  A good way to reduce the risk of error is to make session_start() the first line in your php script.  The $_SESSION array is undefined but mutable even if you do not execute session_start(); so be aware!
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