check if a variable is undefined or NULL

check if a variable is undefined or NULL

linked_class

code

linked_uid

SYTk7

views

18

week_num

52

month_num

12

year_num

21

id: 14328
uid: fhFuS
insdate: 2021-12-27 12:57:44
title: check if a variable is undefined or NULL
additional:
category:
linked_class: code
linked_uid: SYTk7
views: 18
week_num: 52
month_num: 12
year_num: 21

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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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The <resolution> CSS data type, used for describing resolutions in media queries, denotes the pixel density of an output device, i.e., its resolution.
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