Array sort functions in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the sort() function do in PHP?

The sort() function sorts an array in ascending order and reindexes the keys starting from 0.

beginner

How does asort() differ from sort()?

asort() sorts an array in ascending order but preserves the original keys, unlike sort() which reindexes keys.

beginner

What is the purpose of ksort() in PHP?

ksort() sorts an array by its keys in ascending order, keeping the key-value association intact.

intermediate

Explain the difference between rsort() and arsort().

rsort() sorts an array in descending order and reindexes keys, while arsort() sorts in descending order but preserves the original keys.

intermediate

What does krsort() do?

krsort() sorts an array by its keys in descending order, preserving key-value pairs.

Which PHP function sorts an array by values in ascending order and preserves keys?

A ksort()

B sort()

C asort()

D rsort()

asort() sorts values ascending and keeps keys unchanged.

What happens to keys when you use sort() on an array?

A Keys are preserved

B Keys are sorted

C Keys are removed

D Keys are reindexed starting from 0

sort() reindexes keys starting from 0 after sorting.

Which function sorts an array by keys in descending order?

A krsort()

B ksort()

C arsort()

D rsort()

krsort() sorts keys descending, preserving key-value pairs.

If you want to sort an array by values in descending order and keep keys, which function do you use?

A rsort()

B arsort()

C sort()

D asort()

arsort() sorts values descending and preserves keys.

Which function would you use to sort an array by keys in ascending order?

A ksort()

B asort()

C sort()

D arsort()

ksort() sorts keys ascending, preserving key-value pairs.

Describe the difference between sort() and asort() in PHP.

Think about what happens to the keys after sorting.

Explain when you would use ksort() versus sort().

Consider whether you want to sort by keys or values.