Integer type and behavior in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an integer variable with value 10.

PHP

<?php
$number = [1];
echo $number;
?>

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

A10

B"10"

C10.0

D'10'

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the number makes it a string, not an integer.

Using a decimal point makes it a float, not an integer.

The value 10 without quotes is an integer in PHP.

2fill in blank

medium

Complete the code to check if a variable is an integer using a built-in function.

PHP

<?php
$var = 5;
if ([1]($var)) {
    echo "Integer";
} else {
    echo "Not integer";
}
?>

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

Ais_int

Bis_string

Cis_float

Dis_numeric

Attempts:

3 left

💡 Hint

Common Mistakes

Using is_string or is_float instead of is_int.

Using is_numeric which returns true for floats and numeric strings too.

The function is_int() checks if a variable is an integer.

3fill in blank

hard

Fix the error in the code to correctly add two integers and print the result.

PHP

<?php
$a = 7;
$b = 3;
$sum = $a [1] $b;
echo $sum;
?>

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

A-

B+

C.

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using the dot operator . which concatenates strings instead of adding numbers.

Using subtraction or multiplication operators instead of addition.

The plus sign + adds two numbers in PHP. The dot . is for string concatenation.

4fill in blank

hard

Fill both blanks to create an array of squares for numbers 1 to 5 using a loop.

PHP

<?php
$squares = [];
for ($i = 1; $i [1] 5; $i++) {
    $squares[] = $i [2] $i;
}
print_r($squares);
?>

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 loop to stop before 5.

Using addition instead of multiplication for squares.

The loop runs while $i is less than or equal to 5. The square is calculated by multiplying $i by itself.

5fill in blank

hard

Fill all three blanks to create an associative array with keys as numbers and values as their cubes, only for numbers greater than 2.

PHP

<?php
$cubes = [];
foreach (range(1, 5) as [1]) {
    if ([2] > 2) {
        $cubes[[3]] = [2] * [2] * [2];
    }
}
print_r($cubes);
?>

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

A$num

D$val

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in the loop and condition causes errors.

Using undefined variables like $val.

The variable $num is used for the loop and conditions consistently to represent each number.