Default parameter values in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a default value for the parameter.

PHP

<?php
function greet($name = [1]) {
    echo "Hello, $name!";
}
greet();
?>

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

A"Guest"

Bnull

C0

D""

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the string default value.

Using null without handling it inside the function.

The default value for the parameter $name is set to the string "Guest". This means if no argument is passed, it will greet "Guest".

2fill in blank

medium

Complete the code to call the function with the default parameter.

PHP

<?php
function sayAge($age = [1]) {
    echo "Age is $age.";
}
sayAge();
?>

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

A18

Bnull

C0

D21

Attempts:

3 left

💡 Hint

Common Mistakes

Using null as default without checking inside the function.

Passing a string instead of a number.

The function sayAge has a default parameter value of 18. Calling sayAge() without arguments will print "Age is 18."

3fill in blank

hard

Fix the error in the function definition by completing the default parameter value.

PHP

<?php
function multiply($num, $factor = [1]) {
    return $num * $factor;
}
echo multiply(5);
?>

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

A"2"

Bnull

C2

D"two"

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around numbers for default values.

Using null without handling it.

The default value for $factor should be a number without quotes to correctly multiply.

4fill in blank

hard

Fill both blanks to create a function with two parameters, one with a default value.

PHP

<?php
function describe($item, $color = [1]) {
    echo "The $item is $color.";
}
describe([2]);
?>

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

A"red"

B"apple"

C"banana"

D"blue"

Attempts:

3 left

💡 Hint

Common Mistakes

Not passing the required first argument.

Using a non-string default value for color.

The function describe has a default color "red". Calling describe("apple") prints "The apple is red."

5fill in blank

hard

Fill all three blanks to define a function with default parameters and call it correctly.

PHP

<?php
function order($food = [1], $drink = [2]) {
    echo "Order: $food and $drink.";
}
order([3]);
?>

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

A"pizza"

B"water"

C"burger", "juice"

D"burger"

Attempts:

3 left

💡 Hint

Common Mistakes

Passing multiple arguments as one string.

Not matching the number of arguments with parameters.

The function order has default values "pizza" and "water". Calling order("burger") overrides the first default and uses the second default.