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+# Advent of Code 2023 - Day 3
+
+## Problem Statement
+
+## Input
+
+## Part 1
+
+## Part 2
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+<?php
+
+namespace App\AdventSolutions\Year2023\Day3;
+
+use App\AdventSolutions\AbstractSolution;
+
+class Solution2023Day3 extends AbstractSolution
+{
+
+    private array $input;
+
+    public function solvePart1($input): string
+    {
+        $this->input = $input;
+
+        $numbers = $this->findNumbers();
+
+        $numbers_with_symbols = 0;
+
+        foreach ($numbers as $number) {
+            if ($this->hasAdjacentSymbol($number)) {
+                $numbers_with_symbols += $number['number'];
+                print_r('Fant symbol rundt ' . $number['number'] . ' på linje ' . $number['line'] . '. Delsum: ' . $numbers_with_symbols . PHP_EOL);
+            }
+        }
+
+        return "Sum of all numbers with adjacent symbol: <info>$numbers_with_symbols</info>";
+    }
+
+    public function solvePart2($input): string
+    {
+        // Implement the logic for solving part 2 here
+
+        return "Part 2 not yet implemented!";
+    }
+
+    private function findNumbers(): array
+    {
+        $numbers = [];
+        $number = '';
+        $start_position = null;
+
+        foreach ($this->input as $index => $line) {
+            for ($position = 0; $position < strlen($line); $position++) {
+                if (is_numeric($line[$position])) {
+                    if ($start_position === null) {
+                        $start_position = $position;
+                    }
+                    $number .= $line[$position];
+                } else {
+                    if ($start_position !== null) {
+                        $numbers[] = [
+                            'number' => $number,
+                            'start_position' => $start_position,
+                            'end_position' => $position - 1,
+                            'line' => $index,
+                        ];
+                    }
+
+                    $number = '';
+                    $start_position = null;
+                }
+            }
+        }
+
+        return $numbers;
+    }
+
+    private function isSymbol($index, $position): bool
+    {
+        // check if index exists
+        if (!isset($this->input[$index])) {
+            return false;
+        }
+
+        // check if position exists
+        if (!isset($this->input[$index][$position])) {
+            return false;
+        }
+
+        // check if character is . or a number
+        if ($this->input[$index][$position] == '.' || is_numeric($this->input[$index][$position])) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private function hasAdjacentSymbol($number): bool
+    {
+        $start_position = $number['start_position'];
+        $end_position = $number['end_position'];
+        $line = $number['line'];
+
+//        print_r($number['number'] . ' på linje ' . $line . ' fra ' . $start_position . ' til ' . $end_position . PHP_EOL);
+
+        // check top
+        for ($position = $start_position - 1; $position <= $end_position + 1; $position++) {
+//            print_r('Sjekker over på linje ' . $line - 1 . ' posisjon ' . $position . PHP_EOL);
+            if ($this->isSymbol($line - 1, $position)) {
+//                print_r('Fant symbol over' . PHP_EOL);
+                return true;
+            }
+        }
+
+        // check bottom
+        for ($position = $start_position - 1; $position <= $end_position + 1; $position++) {
+//            print_r('Sjekker under på linje ' . $line + 1 . ' posisjon ' . $position . PHP_EOL);
+            if ($this->isSymbol($line + 1, $position)) {
+//                print_r('Fant symbol under' . PHP_EOL);
+                return true;
+            }
+        }
+
+        // check left
+        if ($this->isSymbol($line, $start_position - 1)) {
+//            print_r('Fant symbol til venstre' . PHP_EOL);
+            return true;
+        }
+
+        // check right
+        if ($this->isSymbol($line, $end_position + 1)) {
+//            print_r('Fant symbol til høyre' . PHP_EOL);
+            return true;
+        }
+
+//        print_r('Fant ikke symbol rundt' . PHP_EOL);
+        return false;
+    }
+}