For loop execution model in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5 using a for loop.

PHP

<?php
for ($i = 1; $i [1] 5; $i++) {
    echo $i . " ";
}
?>

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

A>

B<=

C<

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' will stop the loop before reaching 5.

Using '>' or '>=' will cause the loop not to run as expected.

The for loop runs while the condition is true. Using <= ensures the loop includes 5.

2fill in blank

medium

Complete the code to sum numbers from 1 to 10 using a for loop.

PHP

<?php
$sum = 0;
for ($j = 1; $j [1] 10; $j++) {
    $sum += $j;
}
echo $sum;
?>

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

A<=

B<

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' excludes 10 from the sum.

Using '>' or '>=' will not run the loop as intended.

Using <= includes 10 in the sum, so the total is correct.

3fill in blank

hard

Fix the error in the for loop condition to count down from 5 to 1.

PHP

<?php
for ($k = 5; $k [1] 1; $k--) {
    echo $k . " ";
}
?>

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' or '<=' will cause the loop not to run.

Using '>' without '=' will miss the last number 1.

Since $k is decreasing, the loop should continue while $k is greater than or equal to 1.

4fill in blank

hard

Fill both blanks to create a for loop that prints even numbers from 2 to 10.

PHP

<?php
for ($m = [1]; $m [2] 10; $m += 2) {
    echo $m . " ";
}
?>

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

A2

B1

C<=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 1 will print odd numbers.

Using '<' will exclude 10 from the output.

Start at 2 and continue while $m is less than or equal to 10 to print even numbers up to 10.

5fill in blank

hard

Fill all three blanks to create a for loop that prints numbers from 10 down to 2, stepping by 2.

PHP

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

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

A10

B>=

C-=

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' will cause the loop not to run.

Using '+=' will increase the value instead of decreasing.

Start at 10, continue while $n is greater than or equal to 2, and decrease $n by 2 each time.