Variable scope in functions in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print 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$this

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Including the $ sign when declaring a global variable inside a function.

Using a different variable name inside the function.

The global keyword in PHP is used with the variable name without the $ sign to access the global variable inside a function.

2fill in blank

medium

Complete the code to return the value of the global variable inside the function.

PHP

<?php
$value = 5;
function getValue() {
    global [1];
    return $value;
}
echo getValue();
?>

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

Avalue

Bthis

C$value

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using $value with global keyword.

Trying to access the variable without declaring it global.

Inside the function, use global value; without the $ to access the global variable $value.

3fill in blank

hard

Fix the error in the function to correctly modify the global variable.

PHP

<?php
$count = 0;
function increment() {
    [1] $count;
    $count++;
}
increment();
echo $count;
?>

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

Alocal

Bglobal

Cstatic

Dpublic

Attempts:

3 left

💡 Hint

Common Mistakes

Using local or static instead of global.

Not declaring the variable as global and trying to modify it.

To modify a global variable inside a function, you must declare it as global inside the function.

4fill in blank

hard

Fill both blanks to create a function that uses a static variable to count calls.

PHP

<?php
function counter() {
    static [1] = 0;
    [2]++;
    return $count;
}
echo counter();
echo counter();
?>

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

A$count

B$counter

D$calls

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for declaration and increment.

Not using the static keyword.

The static variable $count keeps its value between function calls. We declare it with static $count = 0; and then increment it with $count++;.

5fill in blank

hard

Fill all three blanks to create a function that accesses a global variable and modifies it.

PHP

<?php
$score = 10;
function updateScore() {
    [1] [2];
    $score [3] 5;
}
updateScore();
echo $score;
?>

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

Aglobal

Bscore

C+=

D-=

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to declare the variable as global.

Using the wrong operator like -= instead of +=.

Use global score; to access the global variable, then modify it with $score += 5; to add 5 to it.