Why functions are needed in PHP - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a function named greet.

PHP

<?php
function [1]() {
    echo "Hello!";
}
?>

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

Ahello

Bgreet

CsayHello

Dwelcome

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name than called.

The function name must be greet to match the definition.

2fill in blank

medium

Complete the code to call the function greet.

PHP

<?php
greet[1];
?>

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

A;

B{}

C[]

D()

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting parentheses when calling a function.

Functions in PHP are called with parentheses ().

3fill in blank

hard

Fix the error in the function definition by completing the code.

PHP

<?php
function greet[1] {
    echo "Hello!";
}
?>

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

A[]

B{}

C()

D;

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting parentheses in function definitions.

Function definitions require parentheses () even if no parameters are used.

4fill in blank

hard

Fill both blanks to create a function that takes a name and prints a greeting.

PHP

<?php
function greet([1]) {
    echo "Hello, " . [2] . "!";
}
?>

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

A$name

Bname

C$person

Dperson

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the dollar sign in parameter names.

In PHP, function parameters must have a $ before the variable name, and the same variable is used inside the function.

5fill in blank

hard

Fill all four blanks to create a function that returns the sum of two numbers.

PHP

<?php
function add([1], [2]) {
    return [3] + [4];
}
?>

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

A$a

B$b

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names or missing dollar signs.

The function parameters and return statement must use the same variable names with dollar signs.