Global keyword behavior in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the global variable inside the function.

PHP

<?php
$number = 10;
function showNumber() {
    global [1];
    echo $number;
}
showNumber();
?>

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

Anumber

B$number

C$GLOBALS

Dglobal

Attempts:

3 left

💡 Hint

Common Mistakes

Including the $ sign after the global keyword.

Using $GLOBALS array instead of the global keyword here.

In PHP, to access a global variable inside a function, you use the global keyword followed by the variable name without the $ sign.

2fill in blank

medium

Complete the code to modify the global variable inside the function.

PHP

<?php
$count = 5;
function increment() {
    global [1];
    $count++;
}
increment();
echo $count;
?>

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

A$count

Bglobal

Ccount

D$GLOBALS

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to modify the variable without declaring it global.

Using $count instead of count after global keyword.

To modify a global variable inside a function, you must declare it as global without the $ sign.

3fill in blank

hard

Fix the error in the code to correctly access the global variable inside the function.

PHP

<?php
$value = 20;
function display() {
    echo [1];
}
display();
?>

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

A$value

Bglobal value

Cvalue

D$GLOBALS['value']

Attempts:

3 left

💡 Hint

Common Mistakes

Using the variable name without $ or global keyword.

Trying to echo the variable directly without global or $GLOBALS.

To access a global variable inside a function without declaring it global, use the $GLOBALS array with the variable name as a string key.

4fill in blank

hard

Fill both blanks to create a function that modifies a global variable using the $GLOBALS array.

PHP

<?php
$score = 0;
function addPoint() {
    [1]['score'][2];
}
addPoint();
echo $score;
?>

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

A$GLOBALS

B$score

C++

D--

Attempts:

3 left

💡 Hint

Common Mistakes

Using $score directly inside the function without global or $GLOBALS.

Using the decrement operator instead of increment.

Use the $GLOBALS array to access the global variable and the increment operator ++ to increase its value.

5fill in blank

hard

Fill all three blanks to create a function that resets a global variable to zero using the global keyword.

PHP

<?php
$counter = 10;
function resetCounter() {
    global [1];
    [2] = [3];
}
resetCounter();
echo $counter;
?>

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

Acounter

B$counter

C0

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using $counter after the global keyword.

Assigning null instead of zero.

Declare the variable as global without the $ sign, then assign zero to the variable with the $ sign.