Comparison operators (loose and strict) in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if two variables are equal using loose comparison.

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 the comparison to fail because types differ.

The == operator checks if two values are equal after type juggling (loose comparison).

2fill in blank

medium

Complete the code to check if two variables are equal using strict comparison.

PHP

<?php
$x = 10;
$y = '10';
if ($x [1] $y) {
    echo 'Strictly equal';
} else {
    echo 'Not strictly 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 the comparison to ignore type differences.

The === operator checks if two values are equal and of the same type (strict comparison).

3fill in blank

hard

Fix the error in the code to correctly check if two variables are not equal using strict comparison.

PHP

<?php
$a = 7;
$b = '7';
if ($a [1] $b) {
    echo 'Not strictly equal';
} else {
    echo 'Strictly 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 type differences to be ignored.

The !== operator checks if two values are not equal or not of the same type (strict inequality).

4fill in blank

hard

Fill both blanks to create a dictionary (associative array) with keys as numbers and values as their strict equality check with 10.

PHP

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

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

A===

B==

C!==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing == and === causes inconsistent results.

Using === checks strict equality for both keys with 10.

5fill in blank

hard

Fill all three blanks to create an array filtering numbers strictly greater than 5 and loosely equal to '7'.

PHP

<?php
$numbers = [3, 5, 7, '7', 10];
$filtered = array_filter($numbers, function($num) {
    return $num [1] 5 && $num [2] '7' && $num [3] 7;
});
print_r($filtered);
?>

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

A>

B==

C===

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > changes the filter logic.

Mixing up == and === causes unexpected results.

The code filters numbers greater than 5, loosely equal to '7', and strictly equal to 7.