PHP

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Exercises

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911 mentors

34,116
students have developed their PHP skills on Exercism.

Students

34,116

Submissions

283,021

Mentoring Discussions

3,052

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

259,731

Test Run Pass Rate

15.3% (39832)

Test Run Fail Rate

81.8% (212550)

Test Run Error Rate

2.8% (7349)

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.

Next goal: Build a Representer. Find out more.

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

20,224

50,534 (avg. 2.5)

14,143 (69.9%)

9 (0.0%)

Reverse String

8,704

39,722 (avg. 4.6)

4,683 (53.8%)

177 (2.0%)

Resistor Color

4,662

40,923 (avg. 8.8)

2,422 (52.0%)

52 (1.1%)

Hamming

5,627

24,090 (avg. 4.3)

3,926 (69.8%)

957 (17.0%)

Gigasecond

3,405

10,976 (avg. 3.2)

2,474 (72.7%)

396 (11.6%)

Tournament

1,359

17,877 (avg. 13.2)

463 (34.1%)

37 (2.7%)

Simple Cipher

543

5,718 (avg. 10.5)

235 (43.3%)

13 (2.4%)

High Scores

981

7,406 (avg. 7.5)

498 (50.8%)

17 (1.7%)

Bob

1,447

5,354 (avg. 3.7)

995 (68.8%)

264 (18.2%)

RNA Transcription

1,378

3,489 (avg. 2.5)

1,189 (86.3%)

172 (12.5%)

Luhn

588

3,175 (avg. 5.4)

418 (71.1%)

105 (17.9%)

Isogram

792

3,872 (avg. 4.9)

619 (78.2%)

90 (11.4%)

Robot Name

1,073

7,822 (avg. 7.3)

657 (61.2%)

97 (9.0%)

Difference of Squares

841

1,990 (avg. 2.4)

744 (88.5%)

75 (8.9%)

Grade School

415

2,062 (avg. 5.0)

281 (67.7%)

43 (10.4%)

Robot Simulator

518

2,840 (avg. 5.5)

332 (64.1%)

38 (7.3%)

Run-Length Encoding

493

1,701 (avg. 3.5)

355 (72.0%)

101 (20.5%)

Largest Series Product

431

2,306 (avg. 5.4)

351 (81.4%)

48 (11.1%)

Accumulate

366

860 (avg. 2.3)

291 (79.5%)

10 (2.7%)

Acronym

415

4,883 (avg. 11.8)

240 (57.8%)

9 (2.2%)

All Your Base

223

1,587 (avg. 7.1)

123 (55.2%)

5 (2.2%)

Anagram

453

1,804 (avg. 4.0)

334 (73.7%)

18 (4.0%)

Atbash Cipher

206

1,018 (avg. 4.9)

161 (78.2%)

4 (1.9%)

Beer Song

334

3,220 (avg. 9.6)

208 (62.3%)

3 (0.9%)

Binary

279

1,300 (avg. 4.7)

213 (76.3%)

7 (2.5%)

Bowling

347

1,651 (avg. 4.8)

161 (46.4%)

7 (2.0%)

Change

255

1,598 (avg. 6.3)

93 (36.5%)

5 (2.0%)

Clock

350

1,771 (avg. 5.1)

216 (61.7%)

9 (2.6%)

Collatz Conjecture

163

601 (avg. 3.7)

136 (83.4%)

2 (1.2%)

Connect

125

343 (avg. 2.7)

56 (44.8%)

0 (0.0%)

Crypto Square

448 (avg. 4.7)

56 (58.3%)

1 (1.0%)

Diamond

147

627 (avg. 4.3)

85 (57.8%)

5 (3.4%)

ETL

139

258 (avg. 1.9)

108 (77.7%)

2 (1.4%)

Leap

531

1,127 (avg. 2.1)

448 (84.4%)

25 (4.7%)

Matching Brackets

197

577 (avg. 2.9)

126 (64.0%)

1 (0.5%)

Meetup

100

483 (avg. 4.8)

57 (57.0%)

1 (1.0%)

Minesweeper

166

588 (avg. 3.5)

72 (43.4%)

0 (0.0%)

Nucleotide Count

171

622 (avg. 3.6)

134 (78.4%)

5 (2.9%)

Perfect Numbers

111

431 (avg. 3.9)

87 (78.4%)

4 (3.6%)

Phone Number

223

1,469 (avg. 6.6)

129 (57.8%)

5 (2.2%)

Rail Fence Cipher

367 (avg. 4.6)

35 (43.8%)

1 (1.3%)

Series

122

353 (avg. 2.9)

84 (68.9%)

1 (0.8%)

Sieve

411

695 (avg. 1.7)

289 (70.3%)

24 (5.8%)

Space Age

141

403 (avg. 2.9)

107 (75.9%)

5 (3.5%)

Transpose

104

738 (avg. 7.1)

60 (57.7%)

0 (0.0%)

Triangle

158

635 (avg. 4.0)

117 (74.1%)

4 (2.5%)

Trinary

317

661 (avg. 2.1)

264 (83.3%)

14 (4.4%)

Two Fer

190

616 (avg. 3.2)

152 (80.0%)

5 (2.6%)

Variable Length Quantity

164 (avg. 2.5)

33 (50.8%)

1 (1.5%)

Word Count

482

1,271 (avg. 2.6)

329 (68.3%)

25 (5.2%)

Wordy

240

883 (avg. 3.7)

162 (67.5%)

4 (1.7%)

Armstrong Numbers

129

475 (avg. 3.7)

103 (79.8%)

3 (2.3%)

Flatten Array

141

391 (avg. 2.8)

96 (68.1%)

3 (2.1%)

Queen Attack

106

326 (avg. 3.1)

71 (67.0%)

2 (1.9%)

Raindrops

818

1,239 (avg. 1.5)

717 (87.7%)

76 (9.3%)

Scrabble Score

127

355 (avg. 2.8)

99 (78.0%)

4 (3.1%)

Sum of Multiples

148

827 (avg. 5.6)

92 (62.2%)

4 (2.7%)

Affine Cipher

524 (avg. 8.9)

25 (42.4%)

0 (0.0%)

Allergies

128

600 (avg. 4.7)

67 (52.3%)

2 (1.6%)

Binary Search

121

391 (avg. 3.2)

86 (71.1%)

1 (0.8%)

Book Store

108

208 (avg. 1.9)

42 (38.9%)

3 (2.8%)

Grains

122

1,026 (avg. 8.4)

74 (60.7%)

2 (1.6%)

Markdown

159

401 (avg. 2.5)

55 (34.6%)

1 (0.6%)

Nth Prime

111

486 (avg. 4.4)

73 (65.8%)

1 (0.9%)

OCR Numbers

162 (avg. 2.2)

43 (57.3%)

1 (1.3%)

Pascal's Triangle

297 (avg. 3.4)

53 (60.9%)

2 (2.3%)

Matrix

494 (avg. 6.0)

43 (52.4%)

2 (2.4%)

Prime Factors

404 (avg. 4.1)

69 (70.4%)

3 (3.1%)

D&D Character

473 (avg. 5.9)

42 (52.5%)

1 (1.3%)

Pangram

625

1,159 (avg. 1.9)

547 (87.5%)

60 (9.6%)

Pig Latin

288

489 (avg. 1.7)

185 (64.2%)

8 (2.8%)

Roman Numerals

561

841 (avg. 1.5)

385 (68.6%)

30 (5.3%)

Poker

893 (avg. 9.0)

18 (18.2%)

0 (0.0%)

Linked List

108

865 (avg. 8.0)

55 (50.9%)

1 (0.9%)

Palindrome Products

126

695 (avg. 5.5)

53 (42.1%)

1 (0.8%)

Darts

494 (avg. 5.0)

47 (48.0%)

1 (1.0%)

Mask Credit Card

166

968 (avg. 5.8)

108 (65.1%)

3 (1.8%)

Ordinal Number

230

1,287 (avg. 5.6)

114 (49.6%)

4 (1.7%)

Scale Generator

342 (avg. 4.6)

20 (26.7%)

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

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2,214

petemcfarlane

1,754

kytrinyx

1,416

+ 249 more

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34,116 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

34,116
students have developed their PHP skills on Exercism.