While loop execution model in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a while loop that runs as long as $count is less than 5.

PHP

<?php
$count = 0;
while ([1]) {
    echo $count . "\n";
    $count++;
}
?>

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

A$count >= 5

B$count < 5

C$count == 5

D$count > 5

Attempts:

3 left

💡 Hint

Common Mistakes

Using > instead of < in the condition

Using == which runs only if $count equals 5

The while loop continues as long as the condition is true. Here, it should run while $count is less than 5.

2fill in blank

medium

Complete the code to increment $i by 2 inside the while loop.

PHP

<?php
$i = 0;
while ($i < 10) {
    echo $i . "\n";
    [1];
}
?>

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

A$i += 2

B$i--

C$i = $i + 1

D$i = 2

Attempts:

3 left

💡 Hint

Common Mistakes

Using $i = 2 which resets the value

Using $i-- which decreases the value

To increase $i by 2 each time, use $i += 2;.

3fill in blank

hard

Fix the error in the while loop condition to avoid an infinite loop.

PHP

<?php
$num = 5;
while ([1]) {
    echo $num . "\n";
    $num--;
}
?>

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

A$num == 5

B$num = 0

C$num > 5

D$num >= 0

Attempts:

3 left

💡 Hint

Common Mistakes

Using assignment (=) instead of comparison (>=)

Using a condition that never becomes false

The condition should check if $num is greater than or equal to 0 to stop the loop properly.

4fill in blank

hard

Fill both blanks to create a while loop that prints numbers from 1 to 5.

PHP

<?php
$num = 1;
while ([1]) {
    echo $num . "\n";
    [2];
}
?>

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

A$num <= 5

B$num < 5

C$num++

D$num += 2

Attempts:

3 left

💡 Hint

Common Mistakes

Using $num < 5 which stops at 4

Incrementing $num by 2 which skips numbers

The loop should run while $num is less than or equal to 5, and $num should increase by 1 each time.

5fill in blank

hard

Fill all three blanks to create a while loop that prints even numbers from 2 to 10.

PHP

<?php
$num = [1];
while ([2]) {
    echo $num . "\n";
    [3];
}
?>

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

A2

B$num <= 10

C$num += 2

D$num < 10

Attempts:

3 left

💡 Hint

Common Mistakes

Starting $num at 1 instead of 2

Using $num < 10 which excludes 10

Incrementing by 1 instead of 2

Start $num at 2, run the loop while $num is less than or equal to 10, and increase $num by 2 each time to print even numbers.