PHP

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Exercises

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909 mentors

33,520
students have developed their PHP skills on Exercism.

Students

33,520

Submissions

273,428

Mentoring Discussions

3,024

The PHP track needs attention ⚠️

Building

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81 contributors

Build Test Runners

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Create Test Runners that have the single responsibility of taking a solution, running all tests and returning a standardized output.

Usage statistics

Total Test Runner Runs

250,143

Test Run Pass Rate

15.4% (38408)

Test Run Fail Rate

81.8% (204609)

Test Run Error Rate

2.8% (7126)

Build Analyzers

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Build an Analyzer for PHP: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.

Build Representers

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Build a Representer: a bit of code that has the single responsibility of taking a solution and returning a normalized representation of it.

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Create Practice Exercises

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Practice Exercises are exercises designed to allow students to solve an arbitrary problem, with the aim of them making use of the concepts they have learned so far.

Next goal: Implement 134 practice exercises. Find out more.

Usage statistics

79 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

19,717

49,010 (avg. 2.5)

13,789 (69.9%)

9 (0.0%)

Reverse String

8,417

38,537 (avg. 4.6)

4,528 (53.8%)

164 (1.9%)

Resistor Color

4,505

39,378 (avg. 8.7)

2,342 (52.0%)

48 (1.1%)

Hamming

5,549

23,539 (avg. 4.2)

3,866 (69.7%)

957 (17.2%)

Gigasecond

3,352

10,720 (avg. 3.2)

2,441 (72.8%)

396 (11.8%)

Tournament

1,313

16,645 (avg. 12.7)

443 (33.7%)

35 (2.7%)

Simple Cipher

527

5,616 (avg. 10.7)

224 (42.5%)

12 (2.3%)

High Scores

943

7,105 (avg. 7.5)

475 (50.4%)

17 (1.8%)

Bob

1,426

5,200 (avg. 3.6)

983 (68.9%)

262 (18.4%)

RNA Transcription

1,360

3,440 (avg. 2.5)

1,174 (86.3%)

171 (12.6%)

Luhn

579

3,059 (avg. 5.3)

408 (70.5%)

104 (18.0%)

Isogram

779

3,670 (avg. 4.7)

610 (78.3%)

90 (11.6%)

Robot Name

1,055

7,548 (avg. 7.2)

646 (61.2%)

96 (9.1%)

Difference of Squares

830

1,925 (avg. 2.3)

734 (88.4%)

74 (8.9%)

Grade School

404

1,972 (avg. 4.9)

271 (67.1%)

42 (10.4%)

Robot Simulator

503

2,585 (avg. 5.1)

322 (64.0%)

37 (7.4%)

Run-Length Encoding

486

1,659 (avg. 3.4)

348 (71.6%)

101 (20.8%)

Largest Series Product

423

2,233 (avg. 5.3)

344 (81.3%)

48 (11.3%)

Accumulate

354

815 (avg. 2.3)

280 (79.1%)

10 (2.8%)

Acronym

404

4,745 (avg. 11.7)

232 (57.4%)

9 (2.2%)

All Your Base

213

1,535 (avg. 7.2)

117 (54.9%)

4 (1.9%)

Anagram

446

1,767 (avg. 4.0)

327 (73.3%)

18 (4.0%)

Atbash Cipher

199

986 (avg. 5.0)

154 (77.4%)

4 (2.0%)

Beer Song

326

3,164 (avg. 9.7)

201 (61.7%)

3 (0.9%)

Binary

267

1,223 (avg. 4.6)

205 (76.8%)

7 (2.6%)

Bowling

337

1,462 (avg. 4.3)

156 (46.3%)

7 (2.1%)

Change

249

1,563 (avg. 6.3)

88 (35.3%)

5 (2.0%)

Clock

341

1,731 (avg. 5.1)

212 (62.2%)

9 (2.6%)

Collatz Conjecture

157

574 (avg. 3.7)

130 (82.8%)

2 (1.3%)

Connect

123

341 (avg. 2.8)

55 (44.7%)

0 (0.0%)

Crypto Square

429 (avg. 4.6)

53 (56.4%)

1 (1.1%)

Diamond

140

554 (avg. 4.0)

81 (57.9%)

5 (3.6%)

ETL

137

255 (avg. 1.9)

106 (77.4%)

2 (1.5%)

Leap

523

1,055 (avg. 2.0)

440 (84.1%)

25 (4.8%)

Matching Brackets

189

524 (avg. 2.8)

122 (64.6%)

1 (0.5%)

Meetup

479 (avg. 5.0)

55 (57.3%)

1 (1.0%)

Minesweeper

163

575 (avg. 3.5)

71 (43.6%)

0 (0.0%)

Nucleotide Count

168

612 (avg. 3.6)

131 (78.0%)

5 (3.0%)

Perfect Numbers

108

415 (avg. 3.8)

84 (77.8%)

4 (3.7%)

Phone Number

219

1,455 (avg. 6.6)

127 (58.0%)

4 (1.8%)

Rail Fence Cipher

365 (avg. 4.6)

34 (43.0%)

1 (1.3%)

Series

119

351 (avg. 2.9)

83 (69.7%)

1 (0.8%)

Sieve

409

690 (avg. 1.7)

287 (70.2%)

24 (5.9%)

Space Age

138

393 (avg. 2.8)

104 (75.4%)

5 (3.6%)

Transpose

102

735 (avg. 7.2)

59 (57.8%)

0 (0.0%)

Triangle

154

618 (avg. 4.0)

113 (73.4%)

4 (2.6%)

Trinary

315

655 (avg. 2.1)

262 (83.2%)

14 (4.4%)

Two Fer

188

610 (avg. 3.2)

150 (79.8%)

5 (2.7%)

Variable Length Quantity

162 (avg. 2.6)

32 (50.8%)

1 (1.6%)

Word Count

480

1,269 (avg. 2.6)

328 (68.3%)

25 (5.2%)

Wordy

238

880 (avg. 3.7)

162 (68.1%)

4 (1.7%)

Armstrong Numbers

129

475 (avg. 3.7)

103 (79.8%)

3 (2.3%)

Flatten Array

139

382 (avg. 2.7)

94 (67.6%)

2 (1.4%)

Queen Attack

104

316 (avg. 3.0)

69 (66.3%)

2 (1.9%)

Raindrops

816

1,234 (avg. 1.5)

715 (87.6%)

76 (9.3%)

Scrabble Score

126

354 (avg. 2.8)

98 (77.8%)

3 (2.4%)

Sum of Multiples

147

820 (avg. 5.6)

91 (61.9%)

3 (2.0%)

Affine Cipher

524 (avg. 8.9)

25 (42.4%)

0 (0.0%)

Allergies

124

570 (avg. 4.6)

66 (53.2%)

2 (1.6%)

Binary Search

119

379 (avg. 3.2)

85 (71.4%)

1 (0.8%)

Book Store

108

208 (avg. 1.9)

42 (38.9%)

3 (2.8%)

Grains

120

989 (avg. 8.2)

73 (60.8%)

2 (1.7%)

Markdown

158

393 (avg. 2.5)

55 (34.8%)

0 (0.0%)

Nth Prime

111

486 (avg. 4.4)

73 (65.8%)

1 (0.9%)

OCR Numbers

162 (avg. 2.2)

43 (58.1%)

1 (1.4%)

Pascal's Triangle

296 (avg. 3.4)

52 (60.5%)

2 (2.3%)

Matrix

458 (avg. 5.9)

40 (51.9%)

2 (2.6%)

Prime Factors

404 (avg. 4.1)

69 (70.4%)

3 (3.1%)

D&D Character

426 (avg. 5.5)

40 (51.3%)

1 (1.3%)

Pangram

622

1,138 (avg. 1.8)

545 (87.6%)

60 (9.6%)

Pig Latin

286

475 (avg. 1.7)

184 (64.3%)

7 (2.4%)

Roman Numerals

557

819 (avg. 1.5)

383 (68.8%)

30 (5.4%)

Poker

795 (avg. 8.1)

17 (17.3%)

0 (0.0%)

Linked List

108

865 (avg. 8.0)

55 (50.9%)

1 (0.9%)

Palindrome Products

124

662 (avg. 5.3)

52 (41.9%)

1 (0.8%)

Darts

491 (avg. 5.1)

46 (47.9%)

1 (1.0%)

Mask Credit Card

161

949 (avg. 5.9)

105 (65.2%)

3 (1.9%)

Ordinal Number

227

1,265 (avg. 5.6)

112 (49.3%)

4 (1.8%)

Scale Generator

265 (avg. 3.6)

19 (26.0%)

2 (2.7%)

55 unimplemented practice exercises

Alphametics

Bank Account

Binary Search Tree

Bottle Song

Circular Buffer

Complex Numbers

Custom Set

DOT DSL

Dominoes

Error Handling

Food Chain

Forth

Go Counting

Grep

Hangman

House

ISBN Verifier

Killer Sudoku Helper

Kindergarten Garden

Knapsack

Ledger

Lens Person

List Ops

Micro Blog

POV

PaaS I/O

Parallel Letter Frequency

Protein Translation

Proverb

Pythagorean Triplet

REST API

Rational Numbers

React

Rectangles

Resistor Color Duo

Resistor Color Trio

Rotational Cipher

SGF Parsing

Saddle Points

Satellite

Say

Secret Handshake

Simple Linked List

Spiral Matrix

Square Root

State of Tic-Tac-Toe

Strain

Sublist

Tree Building

Twelve Days

Two Bucket

Word Search

Yacht

Zebra Puzzle

Zipper

Volunteers

261

dstockto

2,214

petemcfarlane

1,754

kytrinyx

1,396

+ 249 more

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33,520 students have developed their PHP skills on Exercism.

The PHP track needs attention ⚠️

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Usage statistics

Build Analyzers

Build Representers

Create Practice Exercises

Usage statistics

We 💙 our volunteers

33,520
students have developed their PHP skills on Exercism.