[Solved] What will be the output of the following PHP code?session_start(); $_SESSION['user'] = 'Alice'; session_unset(); echo isset($_SESSION['user']) ? 'Exists' : 'Not exists'; | PHP

PHP - Sessions and Cookies

What will be the output of the following PHP code?

session_start();
$_SESSION['user'] = 'Alice';
session_unset();
echo isset($_SESSION['user']) ? 'Exists' : 'Not exists';

AExists

BError: Undefined index

CNot exists

DEmpty string

Step-by-Step Solution

Solution:

Step 1: Set and then unset session variables
The code sets $_SESSION['user'] to 'Alice', then calls session_unset() which clears all session variables.
Step 2: Check if session variable exists after unset
Since variables are cleared, isset($_SESSION['user']) returns false, so output is 'Not exists'.
Final Answer:
Not exists -> Option C
Quick Check:
session_unset() clears variables = C [OK]

Quick Trick: session_unset() clears variables, so isset returns false [OK]

Common Mistakes:

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