[Solved] Consider this PHP code snippet: <?php echo 'User ID: ' . $_GET['user_id']; ?> What is the main problem if the URL does not include user_id parameter? | PHP

PHP - Superglobals and Web Context

Consider this PHP code snippet:

<?php
echo 'User ID: ' . $_GET['user_id'];
?>

What is the main problem if the URL does not include user_id parameter?

AIt will print 'User ID: ' with no value.

BIt will cause a Notice about undefined index.

CIt will cause a fatal error and stop the script.

DIt will automatically assign a default value.

Step-by-Step Solution

Solution:

Step 1: Understand accessing missing $_GET keys
Accessing $_GET['user_id'] when it is not set triggers a PHP Notice about undefined index.
Step 2: Differentiate error types
This is not a fatal error, so the script continues, but a warning appears. No default value is assigned automatically.
Final Answer:
It will cause a Notice about undefined index. -> Option B
Quick Check:
Missing $_GET key triggers Notice [OK]

Quick Trick: Check if parameter exists before using $_GET['key'] [OK]

Common Mistakes:

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