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Learn Functional Programming in PHP

Challenge 1: Eliminate Exceptions Using the Either Monad

Test your knowledge by rewriting the given code without using any exceptions.

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A code snippet is given below. It has an authenticateUser function that authenticates the provided username and password with the stored username and password. If authentication fails, the program throws an exception.

PHP
<?php
const USER_DATA = [
  'password' => '$2y$10$gaGFDPMaVRS61ONjnkGQAODo64voLOUJK1AlokiZY2HY3QiPE4zHq',
  'username' => 'kelly92',
  'admin' => false,
]; // valid password is trap_223
function authenticateUser(string $username, string $password): array
{
  if ($username !== USER_DATA['username']) {
    throw new Exception('Sorry, your username is invalid');
  }
  if (!password_verify($password, USER_DATA['password'])) {
    throw new Exception('Sorry, your password is invalid');
  }
  return USER_DATA;
}
 
authenticateUser('Some_User_Name','Some_Password');
?>

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