✨ Finit le jour 2 et commence le 1 et le 3

day_1/part_1.php

@@ -0,0 +1,35 @@
+<?php
+
+$lines = array_filter(explode("\n", file_get_contents(__DIR__.'/input.txt')), static fn($line) =>!empty($line));
+
+$count = 0;
+$position = 50;
+
+echo 'The dial starts by pointing at 50'."\n";
+
+function checkPosition(&$position)
+{
+    if ($position < 0) {
+        $position = 100 - abs($position);
+    } elseif ($position > 99) {
+        $position = $position - 100;
+    }
+}
+
+foreach ($lines as $line) {
+    $direction = substr($line, 0, 1);
+    $number = (int)substr($line, 1) % 100;
+    if ($direction === 'L') {
+        $position -= $number;
+        checkPosition($position);
+    } elseif ($direction === 'R') {
+        $position += $number;
+        checkPosition($position);
+    }
+
+    if ($position === 0) {
+        $count++;
+    }
+
+    echo sprintf('The dial is rotated %s to point at %u | count : %u%s', $line,$position, $count, "\n");
+}