Why is my code showing 'Notice: Undefined index: id' despite checking if it's set?

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PHP 7 Notice Undefined Index Solution Tutorial PHP 7 Notice Undefined Index Solution Tutorial
Solution for Notice: Undefined index: in index.php on line | PHP Tutorials Solution for Notice: Undefined index: in index.php on line | PHP Tutorials
Solving the Undefined index: id Error in PHP: A Simplified Guide Solving the Undefined index: id Error in PHP: A Simplified Guide
Fix Fix 'Undefined Index: Id' Error in PHP - 100% Solution
Exception #0 (Exception): Notice: Undefined index: id in Iterator.php on line 63 Exception #0 (Exception): Notice: Undefined index: id in Iterator.php on line 63
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Solution for Notice: Undefined variable: in index.php on line | PHP Tutorials Solution for Notice: Undefined variable: in index.php on line | PHP Tutorials