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07.29.2003 at 04:14AM PDT, ID: 20693415

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5.8

PHP - Undefined index

Zone: PHP Installation

Tags: undefined, php, index

Here's an error that I am stuck with, really clueless as to why the error: Notice: Undefined index keep appearing and the line giving the problem is $_GET method or function. I created 2 simple forms. One is called myform.php and the form contains 2 input types, namely firstname and age. Another form is called action.php which prints out the name and age. The form returns error: undefined index when using $_GET["firstname"] but returns no error when using $_POST["firstname"]. Why is this so? I had tried all means to solve the error by setting register_globals = on and reinstalling the web server, mySQL and PHP but the error, undefined index still appears! I am at my wits end. Pls help. Btw, I am using IIS5.0, MySQL 4.0.14 and PHP4.3.2

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Question Stats

Zone: Web Development

Question Asked By: wyan_wee

Solution Provided By: rstorey2079

Participating Experts: 6

Solution Grade: C

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07.29.2003 at 08:53AM PDT, ID: 9028951

waygood:

If you could actually show us the code in question we will be able to help. The problem is a little too general to acertain what is going wrong.

07.29.2003 at 10:06AM PDT, ID: 9029553

ThG:

that's the way it has to be.. trying to access $_GET["firstname"] when it doesn't exist generates an error.
either you turn off that error with error_reporting(E_ALL ^ E_NOTICE) at the top, or you FIRST check with isset($_GET["firstname"])

07.30.2003 at 04:35AM PDT, ID: 9035423

wyan_wee:

Hi,

I have tried using isset. This is what I wrote:
$timeout = (isset($_GET["timeout"]) ? $_GET["timeout"] : $_POST["timeout"]);
and I got the error:
Notice: Undefined index: timeout in C:\Applications\Anythink\php_app\logshare\login.php on line 2. I don't know if I had wrote it correctly and also tried writing:
if (isset($_GET["timeout"])
$timeout = $_GET["timeout"];
but I still get the same error.

ThG: I do not quite understand about the error_reporting(E_ALL ^ E_NOTICE) that you mentioned as I an new to PHP. Can you elaborate more?

Thank you

is equal to if $_post["editmode"] got value then use value in $_post["editmode"] else use value in $_get["editmode"]

07.30.2003 at 04:52AM PDT, ID: 9035486

waygood:

If you are messing around with POSTS and GETS then WHy not use $_REQUEST instead. $_REQUEST contains POST and GET data in the order specified in the variable order configuration. Since the order is generally EGPCS, then POST will overwrite any GET variables.

POST $x=1, $y=2
GET $y=3, $z=4

Then REQUEST would have $x=1, $y=2, $z=4 since the POST value of $y overwrites the $y value of GET.

if(!empty($_REQUEST['timeout']))
{
$timeout=$_REQUEST['timeout'];
}
else
{
$timeout='default value';
}

empty checks for isset and if the variable is empty ('') or null

07.30.2003 at 05:00AM PDT, ID: 9035530

wyan_wee:

Hi,

As the codes were done by some other programmer previously and it seems that the codes were running fine on his/her pc but not on mine so I was suspecting if it has got to do with any installation or configuration problem. Furthermore, the project is almost half done so changing or adding these codes would be quite a chore. Are there any other alternatives to it?

07.30.2003 at 05:38AM PDT, ID: 9035750

waygood:

What would be more of a chore, replacing code which doesn't work with code that does (assuming it does) or patching it up?
What setup have you got on your computer, Apache 1.3, PHP4?

Your code is assuming that at least one of these variables is set, try print_r($_POST) to see if you are accessing the variables correctly.

Then try

if(isset($_GET["timeout"])
{
$timeout=$_GET["timeout"];
}
else
{
if(isset($_POST["timeout"])
{
$timeout=$_POST["timeout"];
}
else
{
$timeout=default if both dont exist;
}
}

07.30.2003 at 05:40AM PDT, ID: 9035766

waygood:

sorry just saw IIS5.0, MySQL 4.0.14 and PHP4.3.2, which means you can use $_POST, $_GET etc..

07.31.2003 at 07:49AM PDT, ID: 9042686

wyan_wee:

Hi,

I suspect that there's something wrong with my configuration instead of the codes because the line $existingSession=$HTTP_COOKIE_VARS["SessionData"]; is giving me (Notice: Undefined index: SessionData in C:\Applications\klacks_ass\a3-partb.php on line 113) error as well.

08.02.2003 at 07:23PM PDT, ID: 9056531

ggerardo:

Check if the form tag look like this : (method="post")

<form name="login" method="post" action="action.php">

About POST and GET
--------------------------

There are two methods that you can use when creating a form in HTML: Post and get as in:
If you don't specify a method, then the Web server assumes that you are using the get method.
What's the deal? They almost do the same thing? hmm .... almost
You may notice that URL looks a lot longer after you submit a form that uses the get method. For example, you may see something like:

http://www.mysite.com/form.php?name=Gerardo&age=25&comment=I+love+PHP

That's because the get method puts the contents of the form right in the URL. There a few disaventages to this. First, there is a limit to how much data you can send through a form using this method, on many systems this limit is 256 characters. Also, the individual get queries may be stored in you web server logs and other people may be able to decipher data sent from your forms that use this method.

The post method was created to correct the inadequacies of the get method. The information send using the post mehod is not visible in the URL, and form data cannot be deciphered by lookin in the Web server logs. There also ins't such a small limint of data that can be send form a form.

I suggest to use the get method just to debug your code.
____________
GeRaRDo
ggerardo@hotmail.com

10.13.2003 at 10:24AM PDT, ID: 9541660

us111:

No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Answered by: waygood

Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

us111
EE Cleanup Volunteer

10.14.2003 at 06:15AM PDT, ID: 9546673

rstorey2079:

NOTICE is not a real error. It is just a warning that you are using an undefined index in an array somewhere. I would just turn off notices in my php.ini file (set error reporting to all except notices, as someone posted before). You do not need to change your code.

Accepted Solution

05.27.2005 at 12:29PM PDT, ID: 14097821

cbehnke:

I found this posting when searching for an answer to a similar problem so I thought I'd tack this on here as well...

To turn off error reporting without changing your php.ini globals, add this to your script:

error_reporting(E_ALL ^ E_NOTICE);

20080236-EE-VQP-29