Development

Aurolieen/FileOwners.php

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+<?php
+
+namespace Aurolieen;
+
+/**
+ * Assessment 1. File Owners
+ *
+ * Class FileOwners
+ * @package Aurolieen
+ */
+class FileOwners
+{
+    /**
+     * Groups the provided files by their owners.
+     *
+     * @param array $files Map containing file keys and owner values.
+     * @return array The input files grouped by their owners.
+     */
+    public function groupByOwners($files)
+    {
+        if (empty($files) || !is_array($files)) return [];
+        $grouped = [];
+        foreach ($files as $file => $owner)
+        {
+            if (!is_string($file) || !is_string($owner)) continue;
+            if (!key_exists($owner, $grouped)) $grouped[$owner] = [];
+            $grouped[$owner][] = $file;
+        }
+        return $grouped;
+    }
+}
+
+$files = [
+    "Input.txt" => "Randy",
+    "Code.py" => "Stan",
+    "Output.txt" => "Randy"
+];
+$fileOwners = new FileOwners;
+var_dump($fileOwners->groupByOwners($files));

Aurolieen/Palindrome.php

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+<?php
+
+namespace Aurolieen;
+
+/**
+ * Assessment 2. Palindrome
+ *
+ * Class Palindrome
+ * @package Aurolieen
+ */
+class Palindrome
+{
+    /**
+     * Checks whether or not the given word is a palindrome.
+     * One-letter or zero-letter strings are not considered palindromes by this algorithm.
+     *
+     * @param string $word The word to check.
+     * @return bool True if the word is a palindrome, false if otherwise.
+     */
+    public function isPalindrome($word)
+    {
+        if (!is_string($word)) return false;
+        $length = strlen($word);
+        if ($length <= 1) return false;
+        $characters = str_split($word);
+        $halfLength =  (int)($length / 2);
+        for ($i = 0; $i < $halfLength; $i++)
+        {
+            if (strcasecmp($characters[$i], $characters[$length - $i - 1]) !== 0) return false;
+        }
+        return true;
+    }
+}
+
+$palindrome = new Palindrome;
+echo $palindrome->isPalindrome('Deleveled');

Aurolieen/Path.php

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+<?php
+
+namespace Aurolieen;
+
+/**
+ * Assessment 4. Path
+ *
+ * @note I have omitted invalid input checks as per the instructions that the input will always be valid.
+ *
+ * Class Path
+ * @package Aurolieen
+ */
+class Path
+{
+    public $currentPath;
+    private $nodes = [];
+
+    /**
+     * Path constructor.
+     * Traverses the path pointer to the provided base path.
+     *
+     * @param string $path The base path.
+     */
+    function __construct($path)
+    {
+        $this->cd($path);
+    }
+
+    /**
+     * Moves the path pointer to the specified new location and updates the string representation of the current path.
+     *
+     * @param string $newPath New path to traverse to.
+     */
+    public function cd($newPath)
+    {
+        $newNodes = explode('/', $newPath);
+        foreach ($newNodes as $index => $node) {
+            switch ($node)
+            {
+                case '':                // If the index equals 0, reset to the root otherwise do nothing.
+                    if ($index === 0) $this->nodes = [];
+                    break;
+                case '..':              // Move up one node.
+                    array_pop($this->nodes);
+                    break;
+                default:                // Add a new node.
+                    array_push($this->nodes, $node);
+                    break;
+            }
+        }
+        $this->currentPath = '/' . implode('/', $this->nodes);
+    }
+}
+
+$path = new Path('/a/b/c/d');
+$path->cd('../x');
+echo $path->currentPath;

Aurolieen/Thesaurus.php

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+<?php
+
+namespace Aurolieen;
+
+use GuzzleHttp\Client;
+
+/**
+ * Assessment 3. Thesaurus
+ *
+ * @note The assessment did not specify any restraints on whether or not the dictionary actually contains any words
+ * besides the ones provided as examples. So returning an empty list of synonyms for pretty much every word would have
+ * been the optimal solution. However, in the spirit of the puzzle I decided against this and used the Datamuse API to
+ * actually obtain real synonyms for the input words should they exist.
+ *
+ * Class Thesaurus
+ * @package Aurolieen
+ */
+class Thesaurus
+{
+    /**
+     * Obtains all synonyms for the provided word if any exist and outputs the result in JSON format.
+     * Only works for words in the English language.
+     *
+     * @param string $word The word for which to obtain the synonyms.
+     * @return string A JSON formatted string of the following layout:
+     *  { "word":<input>, "synonyms":[...] }
+     */
+    public function getSynonyms($word)
+    {
+        $output = [
+            'word' => $word,
+            'synonyms' => []
+        ];
+        if (is_string($word) && strlen($word) > 0) {
+            $synonyms = $this->getSynonymsFromDatamuseAPI($word);
+            $output['synonyms'] = $synonyms;
+        }
+        return json_encode($output);
+    }
+
+    /**
+     * Queries the Datamuse API to obtain synonyms for words in the English language.
+     *
+     * @link https://www.datamuse.com/api/
+     * @param string $word The word for which to obtain the synonyms.
+     * @return array Returns a list of strings that are synonyms of the input.
+     */
+    protected function getSynonymsFromDatamuseAPI($word)
+    {
+        $client = new Client();
+        $options = [
+            'timeout' => 5,
+            'headers' => [
+                'Accept' => 'application/json',
+                'Content-Type' => 'application/json'
+            ]
+        ];
+        $response = $client->get(
+            sprintf('https://api.datamuse.com/words?rel_syn=%s', rawurlencode($word)),
+            $options);
+        if ($response->getStatusCode() !== 200) return [];
+        $decoded = json_decode($response->getBody());
+        if (empty($decoded)) return [];
+        return array_column($decoded, 'word');
+    }
+}

Aurolieen/composer.json

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+{
+    "name": "aurolieen/php-assessments",
+    "description": "PHP assessments intended for De Internet Jongens.",
+    "type": "project",
+    "require-dev": {
+        "phpunit/phpunit": "8.*"
+    },
+    "authors": [
+        {
+            "name": "Chris van Zanten",
+            "email": "git@chrisvanzanten.nl"
+        }
+    ],
+    "autoload": {
+        "psr-0": {
+            "Aurolieen\\": ""
+        }
+    },
+    "require": {
+        "guzzlehttp/guzzle": "^6.5"
+    }
+}