✨ Finit le 6e jours

day_6/part_1.php

@@ -0,0 +1,35 @@
+<?php
+
+include '../functions.php';
+
+$array = array_map(fn($row) => array_filter(explode(' ', $row)), explode("\n", file_get_contents('./input.txt')));
+
+$array = matrix_rotate_clockwise($array);
+
+$sums = [];
+foreach ($array as $row) {
+    $operation = array_shift($row);
+    if ($operation == '+') {
+        $data = array_sum($row);
+    }
+    if ($operation == '*') {
+        $data = array_reduce($row, function($carry, $item) {
+            $carry *= $item;
+            return $carry;
+        }, 1);
+    }
+
+    $sums[] = $data;
+    print_message(sprintf('%s = %s', implode($operation, $row), $data));
+}
+
+print_message(array_sum($sums));
+
+function matrix_rotate_clockwise($matrix)
+{
+    array_unshift($matrix, null);
+    $matrix = call_user_func_array('array_map', $matrix);
+    $matrix = array_map('array_reverse', $matrix);
+
+    return $matrix;
+}