check if a variable is undefined or NULL

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id: 356867
uid: 5SLTJ
insdate: 2023-02-21 18:24:15
title: check if a variable is undefined or NULL
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This is my test area for webdev. I keep a collection of code here, mostly for my reference. Also if i find a good link, i usually add it here and then forget about it. more...

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