Array count and length in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to count the number of elements in the array.

PHP

<?php
$fruits = ['apple', 'banana', 'cherry'];
$count = [1]($fruits);
echo $count;
?>

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

Acount

Blength

Csize

Dtotal

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'length' which is not a PHP function for arrays.

Using 'size' or 'total' which do not exist as PHP functions.

The count() function returns the number of elements in an array.

2fill in blank

medium

Complete the code to get the length of the string stored in the array element.

PHP

<?php
$words = ['hello', 'world'];
$length = [1]($words[0]);
echo $length;
?>

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

Astrlen

Blength

Csize

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'count' which counts array elements, not string length.

Using 'size' or 'length' which are not PHP functions.

The strlen() function returns the length of a string in PHP.

3fill in blank

hard

Fix the error in the code to correctly count the elements in the array.

PHP

<?php
$numbers = [1, 2, 3, 4];
$total = [1]($numbers);
echo $total;
?>

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

Asize

Bcount

Cstrlen

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using length() which is not a PHP function.

Using strlen() on arrays causes errors.

The correct function to count array elements is count(). Using length or strlen causes errors.

4fill in blank

hard

Fill both blanks to create an associative array with word lengths for words longer than 3 characters.

PHP

<?php
$words = ['cat', 'house', 'dog', 'elephant'];
$lengths = [];
foreach($words as [1]) {
  if(strlen([1]) > 3) {
    $lengths[[1]] = [2];
  }
}
print_r($lengths);
?>

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

A$word

Bstrlen('word')

C'length'

Dstrlen($word)

Attempts:

3 left

💡 Hint

Common Mistakes

Using string literals instead of variables for keys.

Using strlen('word') which returns length of the literal 'word', not the variable.

In PHP, to create an associative array with keys and values, you use the syntax 'key' => value. Here, the key is the word itself, and the value is its length using strlen($word).

5fill in blank

hard

Fill all three blanks to create a filtered array of words longer than 4 characters with their lengths.

PHP

<?php
$words = ['sun', 'moon', 'stars', 'sky'];
$result = array_filter(array_map(function([1]) {
    return ['[2]' => [1], '[3]' => strlen([1])];
}, $words), function($item) {
    return $item['length'] > 4;
});
print_r($result);
?>

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

A$word

Bword

Clength

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names without $ in function parameters.

Using incorrect keys like 'name' instead of 'word' or 'length'.

The function parameter should be $word. The key for the word is 'word' and the key for length is 'length'. This creates an array of words with their lengths, then filters those longer than 4.