How to solve undefined index error

Question

if(isset($_SESSION['evt_year']) 
   || isset($_SESSION['evt_title']) 
   || isset($_SESSION['evt_sdate']) 
   || isset($_SESSION['evt_place']) 
   || isset($_SESSION['evt_stime']) 
   || isset($_SESSION['evt_etime']) 
   || isset($_SESSION['evt_desc'])) {
    $output.=$_GET['title']; //the error is here
}
else {
    $output.="";
}

Notice the error I got:

Undefined index: title in C:\xampp\htdocs\ICT\abc\cal1\EventCalender\classes\EventRecordForm.php on line 13

$_GET['title'] hasn't been set. Is the `` withe the name 'title' defined on your form, or is the variable set in your querystring? — , Sep 19 '13 at 07:21
the variable set is in the query string. but still got the same undefined error... should i change into some thing else? like REQUEST or POST. — Alin, Sep 19 '13 at 07:29
@Alin just FYI, this is a notice. Which you can avoid printing in page by putting this `error_reporting(E_ALL ^ E_NOTICE)` code on top of your php files. This will print out all other errors except notices. That being said; best practices for this kind of error is to define variables. — Maz, Sep 19 '13 at 08:05

score 4 · Accepted Answer · answered Sep 19 '13 at 07:31

4

You are testing a lot of variables, but none of them are the variable that is read from.

should be e.g.:

if (isset($_GET['title'])) {
     $output.=$_GET['title']; // there is no error here
}

answered Sep 19 '13 at 07:31

AD7six

63,116
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score 1 · Answer 2 · answered Sep 19 '13 at 07:31

1

Just check isset() on the $_GET variable before appending it:

if ( isset( $_GET['title'] ) ) $output.=$_GET['title'];

The error occurs because $_GET['title'] has not been populated.

answered Sep 19 '13 at 07:31

Patrick Moore

13,251
5
38
63

score 1 · Answer 3 · answered Sep 19 '13 at 07:35

1

Before you check/use a variable, it needs to be defined or checked it it really exists. This has been introduced in PHP 5.3.0.

WRONG:

$output = $_GET['title'];

CORRECT:

if (isset($_GET['title'])) {
    $output = $_GET['title'];
}

answered Sep 19 '13 at 07:35

Sliq

15,937
27
110
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How to solve undefined index error

3 Answers3