From 6d8fb621d1e93b83786890d6d9cb6f0d8defa8ae Mon Sep 17 00:00:00 2001
From: DJ O'Leary <dijitol@proton.me>
Date: Fri, 26 Jun 2026 18:04:09 +0200
Subject: refactor!: invert repo directory structure

now is language first
---
 php/2024/day_04/part_01.php | 94 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 php/2024/day_04/part_01.php

(limited to 'php/2024/day_04/part_01.php')

diff --git a/php/2024/day_04/part_01.php b/php/2024/day_04/part_01.php
new file mode 100644
index 0000000..0faa5b0
--- /dev/null
+++ b/php/2024/day_04/part_01.php
@@ -0,0 +1,94 @@
+<?php
+
+declare(strict_types=1);
+
+spl_autoload_register(fn (string $className) => require "{$className}.php");
+
+// Assumes executed from workspace root
+$input = new Input('../_input/day_04.txt');
+if ($input->contents === "") {
+    throw new RuntimeException("File not found");
+}
+
+$grid = $input->toGrid();
+
+$matchCount = 0;
+foreach ($grid->data as $y => $row) {
+    foreach ($row as $x => $char) {
+        if ($char !== 'X') {
+            continue;
+        }
+
+        $start = new Position($x, $y);
+
+        $possibleMatches = [];
+
+        $possibleMatches["north"] = $grid->getStringFromPositions([
+            $start,
+            $start->getNorth(),
+            $start->getNorth()->getNorth(),
+            $start->getNorth()->getNorth()->getNorth(),
+        ]);
+
+        $possibleMatches["east"] = $grid->getStringFromPositions([
+            $start,
+            $start->getEast(),
+            $start->getEast()->getEast(),
+            $start->getEast()->getEast()->getEast(),
+        ]);
+
+        $possibleMatches["south"] = $grid->getStringFromPositions([
+            $start,
+            $start->getSouth(),
+            $start->getSouth()->getSouth(),
+            $start->getSouth()->getSouth()->getSouth(),
+        ]);
+
+        $possibleMatches["west"] = $grid->getStringFromPositions([
+            $start,
+            $start->getWest(),
+            $start->getWest()->getWest(),
+            $start->getWest()->getWest()->getWest(),
+        ]);
+
+        $possibleMatches["north-east"] = $grid->getStringFromPositions([
+            $start,
+            $start->getNorthEast(),
+            $start->getNorthEast()->getNorthEast(),
+            $start->getNorthEast()->getNorthEast()->getNorthEast(),
+        ]);
+
+        $possibleMatches["north-west"] = $grid->getStringFromPositions([
+            $start,
+            $start->getNorthWest(),
+            $start->getNorthWest()->getNorthWest(),
+            $start->getNorthWest()->getNorthWest()->getNorthWest(),
+        ]);
+
+        $possibleMatches["south-east"] = $grid->getStringFromPositions([
+            $start,
+            $start->getSouthEast(),
+            $start->getSouthEast()->getSouthEast(),
+            $start->getSouthEast()->getSouthEast()->getSouthEast(),
+        ]);
+
+        $possibleMatches["south-west"] = $grid->getStringFromPositions([
+            $start,
+            $start->getSouthWest(),
+            $start->getSouthWest()->getSouthWest(),
+            $start->getSouthWest()->getSouthWest()->getSouthWest(),
+        ]);
+
+        $matchCount += array_reduce(
+            array: $possibleMatches,
+            callback: fn (int $acc, string $possibleMatch): int => match ($possibleMatch) {
+                "XMAS" => $acc + 1,
+                default => $acc,
+            },
+            initial: 0,
+        );
+    }
+}
+
+// ANSWER: 2517
+echo $matchCount;
-- 
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