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PHP: “Notice: Undefined variable” and “Notice: Undefined index”

When do we get this error?

Notice: Undefined index: submit in C:\wamp\www\sample.php on line 25

What is the exact meaning of this perticular error?

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  • Show me the code and then I will tell you! Commented Jul 17, 2012 at 3:40
  • Some code examples would be good. Take a look at how other people ask questions. Maybe even search for your question first, rather than answer it. Commented Jul 17, 2012 at 3:43
  • i am sorry... wait i am giving the code... Commented Jul 17, 2012 at 3:47
  • @sayantan bagchi: it's not necessary. There are 4 answers here and billion similar questions in the right "Related" bar Commented Jul 17, 2012 at 3:54
  • 2
    @PhpMyCoder: I decided to get some easy rep points instead ;-P Commented Jul 17, 2012 at 3:57

4 Answers 4

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This means exactly what it says: you're addressing to an undefined index in an array

$arr = array(); echo $arr['foo'];

In the example above the array is empty but I tried to output 'foo' item value, which doesn't exist.

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It means you are trying to access a part of an arraythat isn't there.

If you have an array with 5 elements, you ca get to them via:

$array[0] through to $array[4]

But if you try $array[76] which doesn't exist, you will get an undefined Index error.

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You've probably got an array that you're accessing like $_POST['submit']. That error message is saying is the element 'submit' of the array doesn't exist, and it's throwing a warning.

You should check that array elements exist before using them isset() before you access them to avoid avoid the warning.

Edit: possible duplicate of this: Undefined index in PHP

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i read that post... and i tried that bt its not helping that is why i have post mentioning this particular error...
@sayantan bagchi: what if you read some manual? php.net/isset
It's a standard PHP error. You're probably wondering why your form isn't submitting correctly, which is a different issue.
tahnk you so much... i will look into this...
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have you correctly mentioned the method in your form GET or POST ?? I think you are accessing/testing it without declaring it. Let me know if this is the case.

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