Undefined index

[alirezaok]

hello

i upgarded my php

but some of my script showes :
Notice: Undefined index

what is mean of this notic and how can i slowing it?

[LordShryku]

Usually means you have an undefined portion of an array you are trying to use.

$array = array('foo' => 'bar');
echo $array['foo']; # Fine because it's defined
echo $array['biz']; # Never defined.

[alirezaok]

thank you
please see:

<?php

if ($_GET["pn"]==1) {
include "topt.php";
}
else
{
include "topp.php";
}
?>

Notice: Undefined index: pn in search.php on line 15
line 15 : if ($_GET["pn"]==1) {

how will slove in this sample code?

[LordShryku]

[man]isset[/man] and [man]empty[/man]. Read up on those because they have two distinctly different meanings.

if(isset($_GET['pn']) && $_GET['pn'] == 1) {
   include "topt.php";
}
else {
   include "topp.php";
} 

[alirezaok]

thank you very much