1 files changed, 69 insertions, 0 deletions
diff --git a/php/2024/day_04/Grid.php b/php/2024/day_04/Grid.php
new file mode 100644
index 0000000..75d531b
--- /dev/null
+++ b/php/2024/day_04/Grid.php
@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+class Grid implements Stringable
+{
+    /**
+     * @param string[][] $data
+     */
+    public function __construct(public array $data)
+    {
+    }
+
+    public function __toString(): string
+    {
+        $rowToLine = fn (array $row): string => array_reduce(
+            array: $row,
+            callback: fn (string $acc, string $character): string => $acc . $character,
+            initial: "",
+        );
+
+        return array_reduce(
+            array: $this->data,
+            callback: fn (string $acc, array $row): string => $acc . $rowToLine($row) . PHP_EOL,
+            initial: "",
+        );
+    }
+
+    public function getCharacterAtPosition(Position $position): string
+    {
+        if ($this->isInBounds($position)) {
+            return $this->data[$position->y][$position->x];
+        }
+
+        return ".";
+    }
+
+    /**
+     * @param Position[] $positions
+     */
+    public function getStringFromPositions(array $positions): string
+    {
+        $characters = array_map(
+            callback: fn (Position $position): string => $this->getCharacterAtPosition($position),
+            array: $positions,
+        );
+
+        $string = array_reduce(
+            array: $characters,
+            callback: fn (string $acc, string $character): string => $acc . $character,
+            initial: "",
+        );
+
+        return $string;
+    }
+
+    public function isInBounds(Position $position): bool
+    {
+        if (!array_key_exists($position->y, $this->data)) {
+            return false;
+        }
+
+        if (!array_key_exists($position->x, $this->data[$position->y])) {
+            return false;
+        }
+
+        return true;
+    }
+}