Why variables do not persist between requests in PHP - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a session in PHP.

PHP

<?php
[1]();
?>

Drag options to blanks, or click blank then click option'

Asession_start

Bbegin_session

Cstart_session

Dinit_session

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong function name like start_session()

Forgetting the parentheses () after the function name

In PHP, session_start() is used to begin a session so variables can persist across requests.

2fill in blank

medium

Complete the code to store a value in a session variable.

PHP

<?php
session_start();
$_SESSION[[1]] = 'blue';
?>

Drag options to blanks, or click blank then click option'

A'_color_'

Bcolor

C'color'

D"color"

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the session key

Using double quotes instead of single quotes (both work but single quotes are common)

Session keys must be strings, so use quotes like 'color' to store the value.

3fill in blank

hard

Fix the error in the code to access a session variable.

PHP

<?php
session_start();
echo $_SESSION[1];
?>

Drag options to blanks, or click blank then click option'

A[color]

B(color)

C{color}

D['color']

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or curly braces instead of square brackets

Not quoting the key inside the brackets

To access a session variable, use square brackets with the key as a string: $_SESSION['color'].

4fill in blank

hard

Fill both blanks to check if a session variable exists and then print it.

PHP

<?php
session_start();
if (isset($_SESSION[1])) {
    echo $_SESSION[2];
}
?>

Drag options to blanks, or click blank then click option'

A['user']

B['username']

Attempts:

3 left

💡 Hint

Common Mistakes

Using different keys in the two blanks

Not quoting the keys

Use the same session key inside isset() and when echoing the value to check and print it correctly.

5fill in blank

hard

Fill all three blanks to correctly start a session, set a variable, and then print it.

PHP

<?php
[1]();
$_SESSION[2] = 'admin';
echo $_SESSION[3];
?>

Drag options to blanks, or click blank then click option'

Asession_start

B['role']

Dstart_session

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong function to start session

Using different keys for setting and getting session variable

First, start the session with session_start(). Then set and access the session variable using the same key ['role'].