Why operators matter in PHP - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add two numbers and print the result.

PHP

<?php
$a = 5;
$b = 3;
$result = $a [1] $b;
echo $result;
?>

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

A-

B*

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

The plus operator + adds two numbers together.

2fill in blank

medium

Complete the code to check if two values are equal.

PHP

<?php
$x = 10;
$y = 10;
if ($x [1] $y) {
    echo 'Equal';
} else {
    echo 'Not equal';
}
?>

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

A==

B!=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using assignment = instead of comparison ==.

The double equals == operator checks if two values are equal.

3fill in blank

hard

Fix the error in the code to multiply two numbers correctly.

PHP

<?php
$num1 = 4;
$num2 = 7;
$product = $num1 [1] $num2;
echo $product;
?>

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

A-

B*

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition or division instead of multiplication.

The asterisk * operator multiplies two numbers.

4fill in blank

hard

Fill both blanks to create an array of squares for numbers greater than 3.

PHP

<?php
$numbers = [1, 2, 3, 4, 5];
$squares = array_filter(array_map(fn($n) => $n[1]2, $numbers), fn($n) => $n [2] 9);
print_r($squares);
?>

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

A**

B>

C<

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of power, or wrong comparison operator.

The ** operator raises to a power. The filter keeps squares greater than 9.

5fill in blank

hard

Fill all three blanks to create an associative array with keys as uppercase letters and values greater than 2.

PHP

<?php
$items = ['a' => 1, 'b' => 3, 'c' => 5];
$result = array_filter(array_combine(array_map(fn($k) => [1]($k), array_keys($items)), $items), fn($v) => $v [2] 2 && $v [3] 6);
print_r($result);
?>

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

Astrtoupper

B>

C<

Dstrtolower

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase function or wrong comparison operators.

strtoupper converts keys to uppercase. Values are filtered to be greater than 2 and less than 6.