[Solved] What will be the output of the following PHP code?session_start(); $_SESSION['username'] = 'Bob'; session_unset(); echo isset($_SESSION['username']) ? $_SESSION['username'] : 'Guest'; | PHP

PHP - Sessions and Cookies

What will be the output of the following PHP code?

session_start();
$_SESSION['username'] = 'Bob';
session_unset();
echo isset($_SESSION['username']) ? $_SESSION['username'] : 'Guest';

ABob

BGuest

CEmpty string

DError message

Step-by-Step Solution

Solution:

Step 1: session_start()
Starts the session and initializes $_SESSION superglobal.
Step 2: Assign 'Bob' to $_SESSION['username']
Stores the value in session data.
Step 3: session_unset()
Removes all session variables, so $_SESSION['username'] is unset.
Step 4: Check isset()
Since $_SESSION['username'] is unset, isset() returns false.
Final Answer:
Guest is echoed because the ternary operator falls back to 'Guest'. -> Option B
Quick Check:
session_unset() clears variables, so no username [OK]

Quick Trick: session_unset() clears $_SESSION variables [OK]

Common Mistakes:

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