Given $arr = ['x' => [1,2], 'y' => [3,4,5], 'z' => []];, which code correctly counts only the number of non-empty inner arrays?

hard📝 Application Q9 of 15

PHP - Arrays

Given $arr = ['x' => [1,2], 'y' => [3,4,5], 'z' => []];, which code correctly counts only the number of non-empty inner arrays?

Acount($arr)

Bcount($arr, COUNT_RECURSIVE)

Ccount(array_map('count', $arr))

Dcount(array_filter($arr))

Step-by-Step Solution

Solution:

Step 1: Understand the array and goal
The array has keys 'x', 'y', 'z' with inner arrays; 'z' is empty.
Step 2: Use array_filter to remove empty arrays
array_filter($arr) removes empty inner arrays, so only non-empty remain.
Step 3: Count the filtered array
Counting the filtered array gives the number of non-empty inner arrays.
Final Answer:
count(array_filter($arr)) -> Option D
Quick Check:
array_filter + count() counts non-empty arrays [OK]

Quick Trick: Use array_filter() to exclude empty arrays before counting [OK]

Common Mistakes:

Master "Arrays" in PHP

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More PHP Quizzes