Why arrays are essential in PHP - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an array with three colors.

PHP

$colors = array([1]);

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

A["red", "green", "blue"]

B"red" "green" "blue"

C"red", "green", "blue"

Dred, green, blue

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting commas between items

Not using quotes around string values

Using square brackets inside array()

In PHP, arrays are created using the array() function with comma-separated values inside quotes for strings.

2fill in blank

medium

Complete the code to access the first element of the array.

PHP

echo $colors[1];

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A[0]

B(0)

C{0}

D[1]

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 instead of 0 for the first element

Using parentheses or curly braces instead of square brackets

PHP arrays use zero-based indexing, so the first element is accessed with [0].

3fill in blank

hard

Fix the error in the code to add a new element to the array.

PHP

$colors[1] = "yellow";

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

A[]

B[3]

Cadd

D(3)

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add' which is not valid syntax

Using specific indexes which may cause errors if index exists

Using parentheses instead of square brackets

To add a new element to the end of an array in PHP, use empty square brackets [].

4fill in blank

hard

Fill both blanks to create an associative array with keys and values.

PHP

$person = array([1] => "John", [2] => 25);

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A"name"

B"age"

C"John"

D25

Attempts:

3 left

💡 Hint

Common Mistakes

Using values as keys

Not using quotes around string keys

Associative arrays use keys (like "name" and "age") to map to values.

5fill in blank

hard

Fill all three blanks to loop through the array and print keys and values.

PHP

foreach ($person as [1] => [2]) {
    echo [3] . ": " . [2] . "\n";
}

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

A$key

B$value

C$item

D$person

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable for key and value

Using incorrect variable names

Not using the key in the echo statement

In a foreach loop, $key holds the key and $value holds the value. We print the key and value inside the loop.