Return values in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the sum of two numbers.

PHP

<?php
function add($a, $b) {
    return [1];
}

echo add(3, 4);

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

A$a * $b

B$a - $b

C$a + $b

D$a / $b

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction (-) instead of addition (+).

Forgetting to use the return keyword.

The function should return the sum of $a and $b, so return $a + $b; is correct.

2fill in blank

medium

Complete the code to return the length of a string.

PHP

<?php
function getLength($str) {
    return [1];
}

echo getLength("hello");

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Asize($str)

Bstrlen($str)

Clength($str)

Dcount($str)

Attempts:

3 left

💡 Hint

Common Mistakes

Using count() which is for arrays.

Using non-existent functions like size() or length().

In PHP, strlen() returns the length of a string.

3fill in blank

hard

Fix the error in the function to return the first element of an array.

PHP

<?php
function firstElement($arr) {
    return [1];
}

echo firstElement([10, 20, 30]);

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A$arr[0]

B$arr(0)

C$arr->0

Darr[0]

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets.

Trying to access array elements as object properties.

To access the first element of an array in PHP, use square brackets with index 0: $arr[0].

4fill in blank

hard

Fill both blanks to return a new array with squares of numbers greater than 3.

PHP

<?php
function squaresAboveThree($numbers) {
    return array_combine(
        array_filter($numbers, fn($n) => $n [1] 3),
        array_map(fn($n) => $n[2]2, array_filter($numbers, fn($n) => $n > 3))
    );
}

print_r(squaresAboveThree([1, 2, 3, 4, 5]));

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A>

B*

C**

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication (*) instead of exponentiation for squaring.

Using less than (<) instead of greater than (>) for filtering.

The function filters numbers greater than 3 using > and squares them using the exponent operator **.

5fill in blank

hard

Fill all three blanks to return an associative array with uppercase keys and values greater than 10.

PHP

<?php
function filterAndUppercase($data) {
    $result = [];
    foreach($data as [3] => [2]) {
        if([2] > 10) {
            $result[[1]] = [2];
        }
    }
    return $result;
}

print_r(filterAndUppercase(['a' => 5, 'b' => 15, 'c' => 20]));

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Astrtoupper($key)

B$value

C$key

D$item

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names for keys or values.

Not converting keys to uppercase.

The function returns an array with keys converted to uppercase using strtoupper($key), values as $value, and iterates over $key in the input array.