Does Isset check for NULL PHP?

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About Video:
In this video we are describe best method of detect issue in isset and how to solved it.

Video Description:
1. How to use isset in php
2. How to detect error in isset in php
3. How to solve isset error in php

Answer for the questions:
1. What is if isset ($_ POST submit )) in PHP?
2. Why Isset is used in PHP?
3.Why we use if isset ($_ POST submit ))?

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