Trim functions in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to remove whitespace from the beginning and end of the string.

PHP

$text = "  Hello World  ";
$trimmed = [1]($text);
echo $trimmed;

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

Asubstr

Bstrlen

Cstrtoupper

Dtrim

Attempts:

3 left

💡 Hint

Common Mistakes

Using strlen instead of trim.

Using substr which does not remove spaces.

Using strtoupper which changes case but not spaces.

The trim function removes whitespace from both ends of a string.

2fill in blank

medium

Complete the code to remove whitespace only from the beginning of the string.

PHP

$text = "  Hello World  ";
$trimmedStart = [1]($text);
echo $trimmedStart;

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

Atrim

Bltrim

Crtrim

Dstr_replace

Attempts:

3 left

💡 Hint

Common Mistakes

Using trim which removes spaces from both ends.

Using rtrim which removes spaces from the right end.

Using str_replace which replaces characters but does not trim.

The ltrim function removes whitespace from the start (left side) of a string.

3fill in blank

hard

Fix the error in the code to remove whitespace only from the end of the string.

PHP

$text = "  Hello World  ";
$trimmedEnd = [1]($text);
echo $trimmedEnd;

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

Atrim

Bltrim

Crtrim

Dsubstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using ltrim which removes spaces from the left.

Using trim which removes spaces from both ends.

Using substr which does not remove spaces.

The rtrim function removes whitespace from the end (right side) of a string.

4fill in blank

hard

Fill both blanks to create an array of trimmed words from the list, removing spaces from both ends.

PHP

$words = ["  apple  ", " banana", "cherry  "];
$trimmedWords = array_map([1], $words);
print_r($trimmedWords);

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

Atrim

Bltrim

Crtrim

Dstrtoupper

Attempts:

3 left

💡 Hint

Common Mistakes

Using ltrim or rtrim which only remove spaces from one side.

Using strtoupper which changes case but not spaces.

Using trim inside array_map removes spaces from both ends of each word.

5fill in blank

hard

Fill all three blanks to trim spaces from both ends and check if the trimmed string is empty.

PHP

$text = "  ";
$trimmed = [1]($text);
if ($trimmed [2] '' ) {
    echo [3];
} else {
    echo 'Not empty';
}

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

Atrim

B==

C'Empty string'

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using != instead of == in the condition.

Not trimming before comparison.

Printing wrong message.

First, trim removes spaces. Then, == compares to empty string. If true, print 'Empty string'.