[RESOLVED] Undefined Index/Variable Error

naycoder

I keep getting errors like:

Undefined index: mail in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 3

and

Undefined variable: _session in C:\Program Files\Apache Group\Apache2\htdocs\index.php on line 198

What does Undefined Variable and Undefined Index mean?

rincewind456

http://uk2.php.net/types.array explains the reason behind the first.

http://uk.php.net/manual/en/language.variables.php gives some idea on the second.

naycoder

According to the manual, you just need to have quotes around the string inside the brackets...

so why, with this code:

<?php

$mail = $_POST["mail"];
$phpInfo = $_POST["phpinfo"];
$browscap = $_POST["browscap"];

if($mail !== "" || $phpInfo !== "" || $browscap !== ""){

if($_POST["phpinfo"] == "yes"){
	phpinfo();
}

if($_POST["browscap"] == "yes"){
	$browser = get_browser(null, true);
	print_r($browser);
}

if($_POST["mail"] == "yes"){
	$to = "gvstaff@gmail.com";
	$subject = "TESTING";
	$body = "This is a test\n\nonly a test";

mail($to, $subject, $body);
}
}
else{
?>

<html>
 <head>
 <title>PHP Tests --</title>

<style type="text/css">
td{
width:50px;
}
</style>
 </head>

<body>
<br /><br />

<form method="post" action="<?print_r($_SERVER['PHP_SELF'])?>">
  <table>
    <tr>
      <td>
        PHPInfo::
      </td>
	<td>
	   <input type="text" name="phpinfo" id="phpinfo" value="yes" size="10">
	</td>
    </tr>
		<br />
    <tr>
	<td>
	  Browscap::
	</td>
	<td>
	  <input type="text" name="browscap" id="browscap" value="yes" size="10">
    </tr>
		<br />
    <tr>
	<td>
	  Mail::
	</td>
	<td>
	  <input type="text" name="mail" id="mail" value="yes" size="10">
    </tr>
		<br />
    <tr>
	<td colspan="2">
	  <input type="submit" value="Submit">
	</td>
    </tr>
  </table>
</form>

</body>
</html>

<?php
}
?>

Do I get these errors?

Notice: Undefined index: mail in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 3

Notice: Undefined index: phpinfo in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 4

Notice: Undefined index: browscap in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 5

Notice: Undefined index: phpinfo in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 9

Notice: Undefined index: browscap in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 13

Notice: Undefined index: mail in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 18

_theworks

Well i ran your code and nothing happend ? like nothing at all... not errors no output.
(could have somthing to do with my error settings)

anyway i asumed that nothing was happening because your control structure wasnt working properly?

so i reworte your control structure to see if that was the problem.

<?
if (isset($_POST['mail']) || isset($_POST['phpinfo']) || isset($_POST['browsecap'])) {

$mail = $_POST["mail"];
$phpInfo = $_POST["phpinfo"];
$browscap = $_POST["browscap"];

if (strlen($mail) != 0 || strlen($phpinfo) != 0 || strlen($browscap) != 0) {

if(strtolower($phpinfo) == "yes"){
	phpinfo();
}

if(strtolower($browscap) == "yes"){
	$browser = get_browser(null, true);
	print_r($browser);
}

if($_POST["mail"] == "yes"){
	$to = "someone@somewhere.net";
	$subject = "TESTING";
	$body = "This is a test\n\nonly a test";
	mail($to, $subject, $body);
}

}

}else {


?>

<html>
 <head>
 <title>PHP Tests --</title>......
<body>

it worked for me but i still dont know why your getting those errors..

naycoder

This is interesting -

At first, it seemed to fix it (I was getting the errors right off the bat and now I am not).

But, when I tried it (said yes to phpinfo) I got a similar error to before:

Notice: Undefined variable: phpinfo in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 9

So maybe your halfway there?
In conclusion::
1)Can somebody tell me what Undefined Index and Undefined Variable actually means..the manual is a lil' cryptic
2)Can somebody show me why I am getting these errors and help me to stop getting them

PS - I think that the fact that you got no output at all is due to the fact that you have errors turned off. I think this because I had errors turned off and I got a blank screen as well!

Thanks for all the help so far,
Nay

naycoder

Ok that error was just a typo. I had phpinfo instead of phpInfo (notice the uppercase I)

_theworks

PS - I think that the fact that you got no output at all is due to the fact that you have errors turned off. I think this because I had errors turned off and I got a blank screen as well!

i just checked my php.ini and

error_reporting is on...

also..

"Notice: Undefined index" message usually means that the PHP engine has searched for an index to an array and not found it.

EDIT:

Ok that error was just a typo. I had phpinfo instead of phpInfo (notice the uppercase I)

as far as im aware that shouldnt make a difference

naycoder

I think it did make a difference because I stopped getting the error, but I am still getting the error when I am trying to work with sessions.

For example, I have a script that contains a bunch of usernames and passwords. I have a form where a user logs in, the script loops through the file with the usernames and passwords and waits for a match, when it does, it breaks the loop and puts the username and password into session variables ($SESSION['user'] and $SESSION['password'])

I am getting errors when I try and use these variables

kreamik

index is variable inside array (=> key), and variable is any constant that can be filled any times ..
this problem happen because you don't give value to that variable ..

for some one that not see this error, is because your php.ini sets error report as off ..

you can set this in first line so the error will not shown any more:

<?php error_reporting(E_NONE); ?>

see this:

hxxp://forumphp.web.id/viewtopic.php?p=3635&sid=10889b11f2c83df28d6a37ca19a8d882