✨ Finit le jour 2

day_2/part_1.php

@@ -0,0 +1,40 @@
+<?php
+
+$rounds = explode("\n", file_get_contents('./input.txt'));
+
+$total_score = 0;
+
+$types = [
+    'A' => 'rock',
+    'X' => 'rock',
+    'B' => 'paper',
+    'Y' => 'paper',
+    'C' => 'scissor',
+    'Z' => 'scissor',
+];
+
+$shapes = [
+    'rock'    => 1,
+    'paper'   => 2,
+    'scissor' => 3,
+];
+
+foreach ($rounds as $round) {
+    [$opponent, $you] = explode(' ', $round);
+    $opponent = $types[$opponent];
+    $you = $types[$you];
+
+    if ($you === $opponent) {
+        $total_score += 3;
+    } elseif (
+        ($opponent === 'rock' && $you === 'paper') ||
+        ($opponent === 'paper' && $you === 'scissor') ||
+        ($opponent === 'scissor' && $you === 'rock')
+    ) {
+        $total_score += 6;
+    }
+
+    $total_score += $shapes[$you];
+}
+
+echo $total_score;