Add day 8

src/Utils/Str.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace trizz\AdventOfCode\Utils;
+
+class Str
+{
+    /**
+     * Check if the entirety of string two matches string one.
+     *
+     * @see https://github.com/MueR/adventofcode/blob/master/src/Util/StringUtil.php
+     */
+    public static function matchesAll(string $one, string $two): bool
+    {
+        for ($index = 0, $length = strlen($two); $index < $length; $index++) {
+            if (!str_contains($one, $two[$index])) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Alphabetically sort characters in a string.
+     *
+     * @see https://github.com/MueR/adventofcode/blob/master/src/Util/StringUtil.php
+     */
+    public static function sort(string $string): string
+    {
+        $letters = array_unique(str_split($string));
+        sort($letters, SORT_STRING);
+
+        return implode('', $letters);
+    }
+}