Spaceship operator in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to compare two numbers using the spaceship operator.

PHP

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

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

A===

B!=

C==

D<=>

Attempts:

3 left

💡 Hint

Common Mistakes

Using == or === instead of the spaceship operator.

Using != which only checks inequality.

The spaceship operator <=> compares two values and returns -1, 0, or 1.

2fill in blank

medium

Complete the code to compare two variables using the spaceship operator.

PHP

<?php
$a = 10;
$b = 20;
$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 > or < which return boolean, not -1, 0, or 1.

Using == which only checks equality.

The spaceship operator <=> compares $a and $b and returns -1 because 10 is less than 20.

3fill in blank

hard

Fix the error in the code by replacing the incorrect operator with the spaceship operator.

PHP

<?php
$x = 7;
$y = 7;
$result = $x [1] $y;
echo $result;
?>

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

A<=>

B==

C!=

D===

Attempts:

3 left

💡 Hint

Common Mistakes

Using == or === which return true or false, not -1, 0, or 1.

Using != which checks inequality.

The spaceship operator <=> returns 0 when both values are equal.

4fill in blank

hard

Fill both blanks to create a dictionary that maps numbers to their comparison result with 10 using the spaceship operator.

PHP

<?php
$numbers = [8, 10, 12];
$results = [
    [1] => [2] <=> 10,
    10 => 10 <=> 10,
    12 => 12 <=> 10
];
print_r($results);
?>

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

A8

B==

C<=>

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of <=> for comparison.

Using != which is not a comparison operator for ordering.

The key is 8 and the value is the result of 8 <=> 10 using the spaceship operator.

5fill in blank

hard

Fill all three blanks to create an array that stores the comparison results of each number with 15 using the spaceship operator.

PHP

<?php
$values = [10, 15, 20];
$comparisons = [
    [1] => [1] <=> 15,
    {{BLANK_3}} => {{BLANK_3}} <=> 15,
    20 => 20 <=> 15
];
print_r($comparisons);
?>

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

A10

B<=>

C15

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of <=> for comparison.

Mixing up keys and values in the array.

The keys are 10 and 15, and the values are the result of comparing each key with 15 using the spaceship operator.