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PHP: When should unset be used?
| Posted by MatthewT, 06-27-2008, 11:44 PM |
| I know it sounds like a rather basic question, but aside from unsetting sessions in logout scripts etc, in PHP when should unset fuction be used? is there a general 'rule' for when its best practice to use it?
Just want to make 100% sure that under no circumstances can the value of variables used on a page be carried over from a previous loading of the page right?
I know its probably a dumb question, but better to ask a dumb question than make a dumb mistake right?
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| Posted by Tree NC, 06-27-2008, 11:50 PM |
| The only variables that carry from one pageload to another are session variables and cookies. For more info on unset(), check out PHP's docs.
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| Posted by MatthewT, 06-28-2008, 12:14 AM |
| Thanks for the quick reply, its what I figured, hence the very need for session and cookie variables. Just had some odd results in testing last night.
I think it may have been a very unlikely fluke considence in some random text i inputted in a form and a small error in a cleaning function. Just want't to make sure i wasn't going crazy
Thanks.
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| Posted by greg2007, 06-28-2008, 03:21 PM |
| You might want to check that register_globals is turned off.
It is usually by default now.
And just to confirm, whenever you set a $_SESSION it will remain set until you unset it or the browser is closed (or browser data is cleared).
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| Posted by RN-Chris, 06-28-2008, 03:36 PM |
| or
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| Posted by Codebird, 06-28-2008, 07:06 PM |
| if you need to destroy all session variables you use session_destroy if you need to unset some and keep some you use the unset($_SESSION["blabla"])
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| Posted by MatthewT, 06-30-2008, 04:53 AM |
| Thanks for all the replies
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