List of PHP Kata to Update

PHP 8.0 with PHPUnit 9.5.2 was added. The kata on this page needs to be updated manually. Any help is appreciated!

Summary of Changes

• Files are no longer concatenated, but it should work very similarly as before because solution and preloaded files are autoloaded

  • Accessing Global variables in the user's file (_solution.php):

    Since moving away from file concatenation, the preloaded section, the solution and the tests are split in 3 files, respectively: /workspace/default/_preloaded.php, /workspace/default/_solution.php and /workspace/default/tests/{PHPUnit Test Class Name}.php.

    While most kata ask the user to write a function or a class, some ask the user to define a global variable (for example Binary Multiple of 3 which asks for a regexp). Because the files are no longer concatenated, a global declaration is no longer sufficient to pull the user's global variables into the test suite's scope. One solution is to add require '_solution.php'; at the top level of the test suite as well (require_once will not work). However, this will cause the user's file to be evaluated twice (once by the auto-loading and once by require): for example if the user's file contains the line echo "foo"; at the top-level, foo will be printed twice to the console. Despite this caveat, require still allows to upgrade those kata that only ask for one or several variables. But this will not work when the kata requires both global variables and functions / classes from the user, as the second evaluation caused by the require statement will trigger a duplicate declaration error, e.g.:

    Fatal error: Cannot redeclare foo() (previously declared in /workspace/default/_solution.php:3) in /workspace/default/_solution.php on line 1
    

    Some kata seem impossible to upgrade due to this new runner behavior, see the list below. If you know a way to solve this problem, please get in touch !

• The name of the test class now required to end with Test

• Solution and Preloaded file should have <?php

  • Runner prepends this if missing for backwards compatibility, but any new code should include it

• Test file should have <?php use PHPUnit\Framework\TestCase;

  • Runner prepends this if <?php is missing for backwards compatibility, but any new code should include it

• PHPUnit is updated to 9.5.2 so there are some breaking changes

  • Testing for exceptions:

    PHPUnit 6 removed support for testing for exceptions with PHPDoc annotations:

   /**
     * @expectedException InvalidArgumentException
     * @expectedExceptionMessage The argument was invalid!
   */
   public function testForException()
   {
       functionThatShouldThrow();
   }

  new code should use expectException():

  public function testForException()
  {
      $this->expectException(InvalidArgumentException::class);
      $this->expectExceptionMessage("The argument was invalid!");
      functionThatShouldThrow();
  }

List of Kata

1. 'Magic' recursion call depth number
2. Brainfuck Translator
3. Buddy Pairs
4. Burrows-Wheeler-Transformation
5. Buying a car
6. Car Park Escape
7. Catalog
8. Challenge Fun #14: Target Game
9. Check and Mate?
10. Ciphers #1 - The 01 Cipher
11. Color Choice
12. Connect 4
13. Creating a custom PHP stream wrapper
14. Divide numbers as strings
15. Domain name validator
16. Don't rely on luck. - Potentially impossible to upgrade since the solution and tests are no longer concatenated: calling srand() in the solution has no effect on the tests
17. Esolang Interpreters #1 - Introduction to Esolangs and My First Interpreter (MiniStringFuck)
18. Esolang: InfiniTick
19. Evaluate mathematical expression
20. Experimenting with a sequence of complex numbers
21. Factorial decomposition
22. Family Gift Exchange / Names Out of a Hat
23. Fibo akin
24. Financing Plan on Planet XY140Z-n
25. Fluent Calculator
26. Functions of Integers on Cartesian Plane
27. Generate keywords
28. Get angle between hour and minute hands
29. Going to the cinema
30. Going to zero or to infinity?
31. Good words
32. Hofstadter Q
33. How many dots are covered
34. How Much?
35. Human readable duration format
36. Hungry Hippos
37. Implement the (Unnormalized) Cardinal Sine
38. Is my friend cheating?
39. Is there an arrow missing ? (Relations - Part1: Reflexivity)
40. John and Ann sign up for Codewars
41. Largest Palindromic Product
42. League Player Rank
43. Linked Lists - Get Nth Node
44. Linked Lists - Insert Nth Node
45. List of all Rationals
46. Make sets
47. Mirrored Exponential Chunks
48. Mystery Class
49. Object-Oriented PHP #1 - Classes, Public Properties and Methods - Potentially impossible to upgrade as it requires the user to write both a class and 3 global variables, see above
50. One Line Task: Largest Rectangle
51. Pattern Generator
52. Pattern Generator (mirrored)
53. Perimeter of squares in a rectangle
54. PHP Immutable
55. PHP in Action #5 - PHPMailer Intro
56. Pigs in a Pen
57. Points in the circle
58. Pokemon Damage Calculator
59. Positions Average
60. Product of two squares
61. Pull your words together, man!
62. Rectangle into Squares
63. Reflection in PHP #3 - Using Reflection on Classes
64. Reflection in PHP #4 - Puzzle Challenge [Assessment]
65. RoboScript #4 - RS3 Patterns to the Rescue
66. Roman Numerals Decoder
67. Screen Locking Patterns
68. Selective memory
69. Shortest Distance to a Character
70. Simple assembler interpreter
71. Simple consecutive pairs
72. Simplifying multilinear polynomials
73. Smallest possible sum
74. Snakes and Ladders
75. Square Pi's
76. String Scramble
77. Sum Mixed Array
78. Text align justify
79. Texting with an old-school mobile phone
80. The Skiponacci Sequence
81. The Walker
82. Wave Sorting
83. We are Family
84. Weight for weight

After changing assertEquals with assertSame to avoid this problem some katas failed the automatic change and require manual editing:

1. A Rule of Divisibility by 7
2. Area of an arrow
3. Binary Genetic Algorithms
4. Brainfuck Translator
5. Buying a car
6. Calculate mean and concatenate string
7. Closest and Smallest
8. Convert a String to a Number!
9. Creating a custom PHP stream wrapper
10. Disease Spread
11. Driving School Series #2
12. Easy Cyclist's Training
13. Easy Line
14. Euclidean distance in n dimensions
15. Fibonacci, Tribonacci and friends
16. Financing Plan on Planet XY140Z-n
17. Find the Middle of the Product
18. Find the area of the rectangle!
19. FizzBuzz++
20. Fun with lists: filter
21. Fun with lists: map
22. Functions of Integers on Cartesian Plane
23. Heron's formula
24. How good are you really?
25. How many dots are covered
26. League Player Rank
27. Looking for a benefactor
28. Molecule to atoms
29. Mutual Recursion
30. One Line Task: Largest Rectangle
31. Ordered Count of Characters
32. Parse a linked list from a string
33. Pascal's Triangle
34. Pattern Generator (mirrored)
35. Program a Calculator #2 - 3D Vectors
36. Quarter of the year
37. Regex Tic Tac Toe Win Checker
38. Regexp Basics - is it IPv4 address?
39. Return the closest number multiple of 10
40. Return the first M multiples of N
41. Reverse polish notation calculator
42. Screen Locking Patterns
43. Send in the Clones
44. Simple Fun #181: Rounding
45. Simple Fun #74: Growing Plant
46. Simple Fun #87: Shuffled Array
47. Square Pi's
48. Sum and Length
49. Sum of Array Averages
50. Sum of Intervals
51. Sum of positive
52. The Walker
53. Tiny Three-Pass Compiler
54. Tortoise racing
55. Wave Sorting
56. We are Family
57. simple calculator