PHP Notice: Undefined variable fix

This warning is generated when a variable is not defined in php.
Using the following example i`l generate this notice and i will explain how to avoid this.
Assuming this to be a file named : testfile.php

Accessing testfile.php from browser will give the following notice :

Now let’s fix it :

Isset checks if a variable is defined or not. If is defined will execute it , if not will ignore it but will not generate any notice.

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