day00: Add template

day00/example.txt

@@ -0,0 +1 @@
+

day00/input.txt

@@ -0,0 +1 @@
+

day00/solve.php

@@ -0,0 +1,22 @@
+<?php
+declare(strict_types=1);
+
+require_once(__DIR__.'/../lib/functions.php');
+
+$entries = getLines(__DIR__.'/'.$argv[1].'.txt');
+
+timedPrintf(
+    '[2021-12-00.1] DESCRIPTION: %d [Time: %ss]',
+    (function (array $entries) : int {
+        return 1;
+    }),
+    $entries
+);
+
+timedPrintf(
+    '[2021-12-00.2] DESCRIPTION: %d [Time: %ss]',
+    (function (array $entries) : int {
+        return 1;
+    }),
+    $entries
+);

lib/functions.php

@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+function getLines(string $filename, bool $filter = true) : array
+{
+    $fileContents = file_get_contents($filename);
+    $lines = explode(PHP_EOL, $fileContents);
+
+    return $filter ? array_filter($lines) : $lines;
+}
+
+function timedPrintf(string $format, callable $fn, array $args) : void
+{
+    $timeBefore = microtime(true);
+    $result = $fn($args);
+    $timeAfter = microtime(true);
+
+    printf(
+        $format.PHP_EOL,
+        $result,
+        $timeAfter - $timeBefore,
+    );
+}