Unsetting SESSION without checking if its SET

[smagdy]

Hello,

Is it any bad to do unset(SESSION['var'] without checking if it was set or not?

I mean it works and doesnt give any errors, but I just want to make sure!

Thanks

[eelixduppy]

If it doesn't exist then you will get warnings in your error log. You don't need that clutter, do you? ;)

[smagdy]

Thanks,
One other fast question...

If I want to check if a session is filled with any value.

I just check it like this:
if($_SESSION['var'] != '')

So, is there any problem checking it like that without checking if it was SET or not?

register_global is set OFF

Thanks again

[coopster]

Actually, there are no warnings, no errors thrown when unsetting without checking existence.

<?php 
unset($var); // no error 
unset($_SESSION['var']); // no error 
unset($_SESSION[$var]); // error! $var doesn't exist 
?> 

[smagdy]

Yes, I realized that too... I never got errors or warning though am always unsetting without checking!

[mcavic]

I just check it like this:
if($_SESSION['var'] != '')

That will show a warning if it doesn't exist. This should work though:

if (isset($_SESSION['var'])) {
unset($_SESSION['var']);
}

[eelixduppy]

heh, sorry guys. My memory is starting to slip on these things. But just because PHP works like this doesn't mean it is good coding practice. You should always know where your variables are coming from. It won't matter too much here, but it could in other code.