Yashotantra Academy logo
← PHP theorytheory 0/50 · 0%
level 1
Curious · 0 XP
streak
0d
perfect
0
badges
0

100 XP to Apprentice

Arrays · easy

6. Array Functions

Manipulating arrays functionally.

1 min read2 questionsup to 50 XPtopic 6/50

Read in another language

AI translates the explanation and quiz text while preserving code and answer scoring.

PHP offers a rich standard library for arrays: array_map(), array_filter(), and array_reduce() apply functions across elements without manual loops. sort(), usort(), and ksort() handle ordering.

These functions favor a functional style and often accept closures or callable strings as arguments.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
  • · +15 XP for a perfect first attempt.
  • · +5 XP while a 3-day streak is running.
  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. Which function transforms every element of an array?

  2. 2. Which function removes elements not matching a condition?

Badges

First light
Pass your first topic
Sharp shooter
3 perfect first-try quizzes
On a roll
Study 3 days in a row
Week warrior
Study 7 days in a row
Grinder
Earn 500 XP
Deep diver
Earn 1500 XP