Array chunk and pad in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to split the array into chunks of size 2.

PHP

<?php
$numbers = [1, 2, 3, 4, 5];
$chunks = array_chunk($numbers, [1]);
print_r($chunks);
?>

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

A2

B3

C4

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 instead of 2 will create chunks of size 3.

Using 1 will create chunks of single elements.

The array_chunk function splits the array into smaller arrays of the given size. Here, size 2 means each chunk has 2 elements.

2fill in blank

medium

Complete the code to pad the last chunk to size 3 with zeros.

PHP

<?php
$numbers = [1, 2, 3, 4, 5];
$chunks = array_chunk($numbers, 3);
$last_chunk = $chunks[array_key_last($chunks)];
$padded = array_pad($last_chunk, [1], 0);
print_r($padded);
?>

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

A2

B3

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Padding to 2 will not add enough elements.

Padding to 5 adds unnecessary zeros.

The array_pad function pads the array to the specified length. Here, padding to 3 adds zeros if the last chunk has fewer than 3 elements.

3fill in blank

hard

Fix the error in the code to pad the array to length 6 with -1.

PHP

<?php
$arr = [1, 2, 3];
$padded = array_pad($arr, [1], -1);
print_r($padded);
?>

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

A6

B3

C2

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 or less does not add padding.

Using 4 pads but not to the desired length 6.

To pad the array to length 6, the second argument of array_pad must be 6.

4fill in blank

hard

Fill both blanks to create chunks of size 2 and pad each chunk to size 3 with 0.

PHP

<?php
$numbers = [1, 2, 3, 4, 5];
$chunks = array_chunk($numbers, [1]);
foreach ($chunks as &$chunk) {
    $chunk = array_pad($chunk, [2], 0);
}
print_r($chunks);
?>

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

A2

B3

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 for chunk size creates bigger chunks.

Padding to 0 does not add elements.

Chunks are created with size 2, then each chunk is padded to size 3 with zeros.

5fill in blank

hard

Fill all three blanks to chunk the array by 3, pad each chunk to 4 with -1, and print the result.

PHP

<?php
$values = [10, 20, 30, 40, 50, 60, 70];
$chunks = array_chunk($values, [1]);
foreach ($chunks as &$chunk) {
    $chunk = array_pad($chunk, [2], [3]);
}
print_r($chunks);
?>

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

A3

B4

C-1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 as padding value adds zeros instead of -1.

Padding to 3 does not add extra elements.

The array is split into chunks of 3 elements, then each chunk is padded to length 4 with -1.