✨ Finit le jour 6

day_6/part_1.php

@@ -0,0 +1,12 @@
+<?php
+
+$groups = explode("\n\n", file_get_contents('input.txt'));
+
+$yesses = 0;
+
+foreach ($groups as $group) {
+    $group_yes = implode('', explode("\n", $group));
+    $yesses += count(array_unique(str_split($group_yes)));
+}
+
+echo $yesses;

day_6/part_2.php

@@ -0,0 +1,21 @@
+<?php
+
+$groups = explode("\n\n", file_get_contents('input.txt'));
+
+$yesses = 0;
+
+foreach ($groups as $group) {
+    $persons = explode("\n", $group);
+    if (count($persons) === 1) {
+        $yesses += strlen(current(array_unique($persons)));
+    } else {
+        $persons_letters = array_map(static function($person) {
+            return array_unique(str_split($person));
+        }, $persons);
+
+        $intersect = array_intersect(...$persons_letters);
+        $yesses += count($intersect);
+    }
+}
+
+echo $yesses;