Undefined Variables - How do I stop these warnings?

[aubeasty]

Hi all,

How do I stop errors such as the following:

Notice: Undefined variable: submit in D:\WWWRoot\amws_test\noname4.php3 on line 17?

The line in particular is
if ($submit) {

I am using $submit in the if statement to see if someone has clicked the submit button.

Do I need to initialise the variables at the beginning?

Cheers,

Andrew

[PHPdev]

It is always good programming techinique to initialize your variables prior to using. JMHO But found this which may be of some help

http://www.phpbuilder.com/mail/php-general/2000122/1106.php

[edwardsbc]

The simplest fix is to use if(isset($submit)) instead. This only works if you are not concerned about the value of $submit, just that it exists.

[Tekron-X]

If that variable comes from a html form then you need register_globals set to on 🙂

It is in the php ini and it must look like this register_globals = on
it is under the data handeling section. But this might not be your problem.

[aubeasty]

Hi All,

I'll answer you all one by one 🙂

PHPDev - That's what I was taught many moons ago, but with PHP I don't know how to declare the variables before I use them. ANy ideas or pointers?

Also, the Windows version of PHP has a different setup for errors:
; error_reporting is a bit-field. Or each number up to get desired error
; reporting level
; E_ALL - All errors and warnings
; E_ERROR - fatal run-time errors
; E_WARNING - run-time warnings (non-fatal errors)
; E_PARSE - compile-time parse errors
; E_NOTICE - run-time notices (these are warnings which often result
; from a bug in your code, but it's possible that it was
; intentional (e.g., using an uninitialized variable and
; relying on the fact it's automatically initialized to an
; empty string)
; E_CORE_ERROR - fatal errors that occur during PHP's initial startup
; E_CORE_WARNING - warnings (non-fatal errors) that occur during PHP's
; initial startup
; E_COMPILE_ERROR - fatal compile-time errors
; E_COMPILE_WARNING - compile-time warnings (non-fatal errors)
; E_USER_ERROR - user-generated error message
; E_USER_WARNING - user-generated warning message
; E_USER_NOTICE - user-generated notice message
;
; Examples:
;
; - Show all errors, except for notices
;
;error_reporting = E_ALL & ~E_NOTICE
;
; - Show only errors
;
error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR
;
; - Show all errors except for notices
;
;error_reporting = E_ALL; display all errors, warnings and notices

edwardsbc - I could use that in this instance, but my ultimate goal is to be able to declare the variables before I use them. 🙂

Tekron-X - I have the register_globals=on value in the PHP.ini file

Thanks for your help,

Andrew

[Tekron-X]

No Problem man if you can't figure it out I will look at it more in depth on my system here you just need to send me thourogh code and I will figure it out eventually.

I couldn't be something that I haven'd did already LOL I have done lots of things that caused variable errors like that 🙂