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Exercism

PHP

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Overview

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PHP is a server-side language suited towards web development. The acronym is recursive, standing for PHP: Hypertext Preprocessor. Considerably more versatile than CGI scripting, PHP is often used to add interactivity to plain HTML and bolster web frameworks. The language can be employed on any operating system. PHP is supported by most common web servers and is often handled through an interpreter module. This combines static web code with dynamic inclusions.

Syllabus

  • Hello World
    • Exercism's classic introductory exercise. Just say "Hello, World!".
  • Lucian's Luscious Lasagna
    • Learn about the basics of PHP syntax!
  • Highschool Sweethearts
    • Learn about love and strings!
  • Pizza Pi
    • Learn about integers, floating point numbers and pizza!
  • Annalyn's Infiltration
    • Learn about role playing games and boolean values!
  • Windowing System
    • Learn about classes by developing a windowing system!
  • Language List
    • Learn about functions and arrays!
  • City Office
    • Learn about type declarations and form validation!
  • Lucky Numbers
    • Practice type juggling while helping your friend Kojo with his website.
  • Acronym
    • Convert a long phrase to its acronym.
  • All Your Base
    • Convert a number, represented as a sequence of digits in one base, to any other base.
  • Anagram
    • Given a word and a list of possible anagrams, select the correct sublist.
  • Atbash Cipher
    • Create an implementation of the Atbash cipher, an ancient encryption system created in the Middle East.
  • Bowling
    • Score a bowling game.
  • Change
    • Correctly determine change to be given using the least number of coins.
  • Clock
    • Implement a clock that handles times without dates.
  • Collatz Conjecture
    • Calculate the number of steps to reach 1 using the Collatz conjecture.
  • Connect
    • Compute the result for a game of Hex / Polygon.
  • Crypto Square
    • Implement the classic method for composing secret messages called a square code.
  • Diamond
    • Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.
  • ETL
    • Change the data format for scoring a game to more easily add other languages.
  • Leap
    • Determine whether a given year is a leap year.
  • Matching Brackets
    • Make sure the brackets and braces all match.
  • Meetup
    • Calculate the date of meetups.
  • Micro Blog
    • Given an input string, truncate it to 5 characters.
  • Nucleotide Count
    • Given a DNA string, compute how many times each nucleotide occurs in the string.
  • Perfect Numbers
    • Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers.
  • Phone Number
    • Clean up user-entered phone numbers so that they can be sent SMS messages.
  • Rail Fence Cipher
    • Implement encoding and decoding for the rail fence cipher.
  • Resistor Color
    • Convert a resistor band's color to its numeric representation.
  • Resistor Color Duo
    • Convert color codes, as used on resistors, to a numeric value.
  • Reverse String
    • Reverse a given string.
  • Series
    • Given a string of digits, output all the contiguous substrings of length `n` in that string.
  • Sieve
    • Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.
  • Space Age
    • Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.
  • Transpose
    • Take input text and output it transposed.
  • Triangle
    • Determine if a triangle is equilateral, isosceles, or scalene.
  • Two Fer
    • Create a sentence of the form "One for X, one for me.".
  • Variable Length Quantity
    • Implement variable length quantity encoding and decoding.
  • Word Count
    • Given a phrase, count the occurrences of each word in that phrase.
  • Armstrong Numbers
    • Determine if a number is an Armstrong number.
  • Darts
    • Calculate the points scored in a single toss of a Darts game.
  • Difference of Squares
    • Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
  • Flatten Array
    • Take a nested list and return a single list with all values except nil/null.
  • Gigasecond
    • Given a moment, determine the moment that would be after a gigasecond has passed.
  • Hamming
    • Calculate the Hamming distance between two DNA strands.
  • High Scores
    • Manage a player's High Score list.
  • ISBN Verifier
    • Check if a given string is a valid ISBN-10 number.
  • Line up
    • Help lining up customers at YaÊ»qÅ«b's Deli.
  • Proverb
    • For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.
  • Queen Attack
    • Given the position of two queens on a chess board, indicate whether or not they are positioned so that they can attack each other.
  • Raindrops
    • Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.
  • Say
    • Given a number from 0 to 999,999,999,999, spell out that number in English.
  • Scrabble Score
    • Given a word, compute the Scrabble score for that word.
  • Strain
    • Implement the `keep` and `discard` operation on collections.
  • Sublist
    • Write a function to determine if a list is a sublist of another list.
  • Sum of Multiples
    • Given a number, find the sum of all the multiples of particular numbers up to but not including that number.
  • Twelve Days
    • Output the lyrics to 'The Twelve Days of Christmas'.
  • Yacht
    • Score a single throw of dice in the game Yacht.
  • Affine Cipher
    • Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.
  • Allergies
    • Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.
  • Bank Account
    • Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!
  • Binary Search
    • Implement a binary search algorithm.
  • Binary Search Tree
    • Insert and search for numbers in a binary tree.
  • Book Store
    • To try and encourage more sales of different books from a popular 5 book series, a bookshop has decided to offer discounts of multiple-book purchases.
  • House
    • Output the nursery rhyme 'This is the House that Jack Built'.
  • Kindergarten Garden
    • Given a diagram, determine which plants each child in the kindergarten class is responsible for.
  • Markdown
    • Refactor a Markdown parser.
  • Mask Credit Card
    • Create a function to mask digits of a credit card number.
  • Nth Prime
    • Given a number n, determine what the nth prime is.
  • Pascal's Triangle
    • Compute Pascal's triangle up to a given number of rows.
  • Prime Factors
    • Compute the prime factors of a given natural number.
  • Protein Translation
    • Translate RNA sequences into proteins.
  • Resistor Color Trio
    • Convert color codes, as used on resistors, to a human-readable label.
  • RNA Transcription
    • Given a DNA strand, return its RNA complement.
  • Robot Name
    • Manage robot factory settings.
  • Rotational Cipher
    • Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.
  • Tournament
    • Tally the results of a small football competition.
  • Bob
    • Bob is a lackadaisical teenager. In conversation, his responses are very limited.
  • Bottle Song
    • Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.
  • D&D Character
    • Randomly generate Dungeons & Dragons characters.
  • Food Chain
    • Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.
  • Grains
    • Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
  • Isogram
    • Determine if a word or phrase is an isogram.
  • Luhn
    • Given a number determine whether or not it is valid per the Luhn formula.
  • Matrix
    • Given a string representing a matrix of numbers, return the rows and columns of that matrix.
  • Pangram
    • Determine if a sentence is a pangram.
  • Pig Latin
    • Implement a program that translates from English to Pig Latin.
  • Roman Numerals
    • Convert modern Arabic numbers into Roman numerals.
  • Secret Handshake
    • Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
  • Spiral Matrix
    • Given the size, return a square matrix of numbers in spiral order.
  • Alphametics
    • Given an alphametics puzzle, find the correct solution.
  • Baffling Birthdays
    • Estimate the birthday paradox's probabilities.
  • Eliud's Eggs
    • Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.
  • Killer Sudoku Helper
    • Write a tool that makes it easier to solve Killer Sudokus
  • Knapsack
    • Given a knapsack that can only carry a certain weight, determine which items to put in the knapsack in order to maximize their combined value.
  • Largest Series Product
    • Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.
  • Linked List
    • Implement a doubly linked list.
  • OCR Numbers
    • Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.
  • Poker
    • Pick the best hand(s) from a list of poker hands.
  • Robot Simulator
    • Write a robot simulator.
  • Run-Length Encoding
    • Implement run-length encoding and decoding.
  • State of Tic-Tac-Toe
    • Determine the game state of a match of Tic-Tac-Toe.
  • Swift Scheduling
    • Convert delivery date descriptions to actual delivery dates.
  • Two Bucket
    • Given two buckets of different size, demonstrate how to measure an exact number of liters.
  • Wordy
    • Parse and evaluate simple math word problems returning the answer as an integer.
  • Circular Buffer
    • A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.
  • Flower Field
    • Mark all the flowers in a garden.
  • Grade School
    • Given students' names along with the grade that they are in, create a roster for the school.
  • List Ops
    • Implement basic list operations.
  • Palindrome Products
    • Detect palindrome products in a given range.
  • Simple Cipher
    • Implement a simple shift cipher like Caesar and a more secure substitution cipher
  • Zebra Puzzle
    • Solve the zebra puzzle.

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