anagrams.php

<?php
// 5 kyu - Where my anagrams at?
// What is an anagram? Well, two words are anagrams of each other if they both contain the same letters. For example:
//
// 'abba' & 'baab' == true
//
// 'abba' & 'bbaa' == true
//
// 'abba' & 'abbba' == false
// Write a function that will find all the anagrams of a word from a list. You will be given two inputs a word and an array with words. You should return an array of all the anagrams or an empty array if there are none. For example:
//
// anagrams('abba', ['aabb', 'abcd', 'bbaa', 'dada']); // => ['aabb', 'bbaa']
//
// anagrams('racer', ['crazer', 'carer', 'racar', 'caers', 'racer']); // => ['carer', 'racer']
//
// anagrams('laser', ['lazing', 'lazy',  'lacer']); // => []

function anagrams(string $word, array $words): array {
    $sorted = function($word) { $a = str_split($word); sort($a); return implode($a);};
    $match = $sorted($word);
    $result = [];
    foreach($words as $w) {
        $test = $sorted($w);
        if ($test === $match) {
          $result[] = $w ;
        }
    }
    return $result;
}

// Alternative Solution:
//
// function anagrams(string $word, array $words): array {
//     $sorted = function($word) { $a = str_split($word); sort($a); return implode($a);};
//     $match = $sorted($word);
//     return array_values(array_filter($words, function($w) use($match,$sorted){
//       return $sorted($w) === $match;
//     }));
// }

// function anagrams(string $word, array $words): array {
// $char = count_chars($word, 1);
// $res = [];
//
// foreach($words as $elem){
//   if(count_chars($elem, 1) == $char){
//     $res[] = $elem;
//   }
// }
// return $res;
// }

?>