Php Products Table Issue Undefined Index

I am having trouble coding my inventory_list.

How to solve undefined index error in php

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[LegacyApps❤][0] Fixing undefined index notices in PHP

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Undefined index

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https://docs.google.com/document/d/1Ki452sVKB7yQTxke1LnnvCKPZOGDhiwfPZB-P8pzirw/edit?usp=sharing "Notice: ...

Solved:

There can different reasons behind this error. 1-

how to solve

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PHP Error Undefined Index