Why do I get undefined index

Question

I am trying to pass a variable between two webpages via a url and using php. I am getting the undefined index error.

I have tried multiple ways of doing this and spent the last several hours googling the problem and think the following code should work -- probably just a conceptual error. Am not using ISSET at this point because this is a url pass and it should be set.

The following code is on the passing page:

<DIV>
   <ul>                                    
     <li> <a href ="bulletindisplay.php?link = Bulletins/December_24_2014.pdf" title="Christmas Eve 2014">Christmas Eve, 2014 </a>; </li>     
   </ul>  
  </DIV>

The following code is on bulletindisplay.php

   <div>        
    <?php   
       $link =  $_GET['link'];
       echo $link;
      ?> 
    </div>

Does anyone see my error? Thank you so much for any help.

1

Remove space after link... – Ragnar Jan 23 '15 at 22:26

score 1 · Answer 1 · answered Jan 23 '15 at 22:28

Remove all spaces inside href attribute:

  <DIV>
   <ul>                                    
     <li> <a href="bulletindisplay.php?link=Bulletins/December_24_2014.pdf" title="Christmas Eve 2014">Christmas Eve, 2014 </a>; </li>     
   </ul>  
  </DIV>

Ryan · Answer 2 · 2015-01-24T01:04:01.330

1

You need to remove the space after link in your URL. And you should be using isset because if link is not present in the query string you will see a PHP error.

1. if(isset($_GET['link'])) {
2.     $link = $_GET['link'];
3.     echo $link;
4. }

edited Jan 24 '15 at 01:04

answered Jan 23 '15 at 22:31

Ryan

14,392
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score 1 · Answer 3 · answered Jan 23 '15 at 22:32

1

Just remove spaces inside your link.

bulletindisplay.php?link=Bulletins/December_24_2014.pdf

answered Jan 23 '15 at 22:32

Branimir Đurek

632
5
13

score 1 · Answer 4 · answered Jan 23 '15 at 22:35

1

Remove all spaces and use below code:

<li> <a href="bulletindisplay.php?link=Bulletins/December_24_2014.pdf" title="Christmas Eve 2014">Christmas Eve, 2014 </a>; </li>

and in php :

if(isset($_GET['link'])) {
 $link = $_GET['link'];
 echo $link;
 }

answered Jan 23 '15 at 22:35

Priyank

3,778
3
29
48

score 1 · Answer 5 · answered Jan 23 '15 at 22:42

link = Bulletins/December_24_2014.pdf
//there is a space after link
If you print out $_GET you will get output like this

Array ( [link_] => Bulletins/December_24_2014.pdf )

So

$_GET['link'] !=$_GET['link_']
//$_GET['link'] is not set that's why you got the error

Why do I get undefined index

5 Answers5