Loose comparison vs strict comparison in PHP - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to perform a loose comparison between two variables.

PHP

<?php
$a = 5;
$b = '5';
if ($a [1] $b) {
    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 === instead of == causes strict comparison, which also checks type.

In PHP, == is used for loose comparison, which compares values after type juggling.

2fill in blank

medium

Complete the code to perform a strict comparison between two variables.

PHP

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

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

A!==

B==

C!=

D===

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of === causes loose comparison, ignoring type.

The === operator checks both value and type, so it is a strict comparison.

3fill in blank

hard

Fix the error in the code to correctly check if two variables are not strictly equal.

PHP

<?php
$a = 0;
$b = false;
if ($a [1] $b) {
    echo "Not identical";
} else {
    echo "Identical";
}
?>

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

A!=

B!==

C==

D===

Attempts:

3 left

💡 Hint

Common Mistakes

Using != instead of !== causes loose inequality check.

The !== operator checks if two variables are not identical in value or type.

4fill in blank

hard

Fill both blanks to create a dictionary that maps comparison operators to their descriptions.

PHP

<?php
$comparisons = [
    '[1]' => 'Loose equality',
    '[2]' => 'Strict equality'
];
print_r($comparisons);
?>

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

A==

B===

C!=

D!==

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up operators or using inequality operators.

The == operator is for loose equality, and === is for strict equality.

5fill in blank

hard

Fill all three blanks to complete the code that checks different comparisons and prints results.

PHP

<?php
$a = '0';
$b = 0;
if ($a [1] $b) {
    echo "Loose equal\n";
}
if ($a [2] $b) {
    echo "Strict equal\n";
}
if ($a [3] $b) {
    echo "Not strict equal\n";
}
?>

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

A==

B===

C!==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing != with !== or mixing up equality operators.

The first if uses == for loose equality, the second uses === for strict equality, and the third uses !== for not strict equality.