String search functions (strpos, strstr) in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find the position of the word "world" in the string.

PHP

<?php
$text = "Hello world!";
$pos = [1]($text, "world");
echo $pos;
?>

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

Astrpos

Bstrstr

Csubstr

Dstrlen

Attempts:

3 left

💡 Hint

Common Mistakes

Using strstr instead of strpos, which returns the substring instead of position.

Using substr which extracts part of the string.

Using strlen which returns string length.

The strpos function returns the position of the first occurrence of a substring in a string.

2fill in blank

medium

Complete the code to get the part of the string starting from "world".

PHP

<?php
$text = "Hello world!";
$part = [1]($text, "world");
echo $part;
?>

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

Astrstr

Bstr_replace

Cstrpos

Dsubstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using strpos which returns position, not substring.

Using substr without position.

Using str_replace which replaces text.

The strstr function returns the part of the string starting from the first occurrence of the substring.

3fill in blank

hard

Fix the error in the code to correctly find the position of "test" in the string.

PHP

<?php
$text = "This is a test string.";
$pos = [1]($text, "test");
echo $pos;
?>

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

Astr_replace

Bstrpos

Csubstr

Dstrstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using strstr instead of strpos.

Using substr which extracts substring by position.

Using str_replace which replaces text.

To find the position of a substring, use strpos. strstr returns the substring, not the position.

4fill in blank

hard

Fill both blanks to create a dictionary of words and their lengths for words longer than 3 characters.

PHP

<?php
$words = ["apple", "bat", "cat", "dog", "elephant"];
$lengths = array_filter(array_map(function($word) {
    return strlen($word);
}, $words));
$result = array_filter(array_combine($words, $lengths), function($length) {
    return $length [1] 3;
});
print_r($result);
?>

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

A==

B<

C>

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' which filters shorter words.

Using '==' which filters words exactly length 3.

Using '!=' which filters words not equal to length 3.

The code filters words with length greater than 3 using the '>' operator.

5fill in blank

hard

Fill all three blanks to create an array of words starting with 'a' and their lengths.

PHP

<?php
$words = ["apple", "banana", "apricot", "cherry", "avocado"];
$filtered = array_filter($words, function($word) {
    return [1]($word, 'a') === 0;
});
$lengths = array_map(function($word) {
    return [2]($word);
}, $filtered);
$result = array_combine($filtered, $lengths);
print_r($result);
?>

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

Astrpos

Bstrlen

Cstrstr

Dsubstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using strstr which returns substring, not position.

Using substr which extracts substring by position.

Using wrong function for length.

The code uses strpos to check if the word starts with 'a' (position 0), and strlen to get word lengths.