feat(day3): day 3 in PHP

aoc2024/src/days/day3_part1.php

@@ -0,0 +1,57 @@
+<?php
+$loadFrom = "../../inputs/3/input.txt";
+
+if(!file_exists($loadFrom)) {
+  echo "Missing $loadFrom\n";
+  exit(1);
+}
+
+$input = file_get_contents($loadFrom);
+
+$lookFor = "mul(";
+$lookFor = str_split($lookFor);
+$arr = str_split($input);
+
+$parsed = "";
+$valid = true;
+// Find all where there is the word mul
+
+$validParsed = 0;
+$nums = [];
+for($i = 0; $i < count($arr); $i++) {
+  if(@$lookFor[$validParsed] == $arr[$i]) {
+    $validParsed++;
+    echo "Match for $validParsed - " . $arr[$i] . "\n";
+  } // Whole part has matched this far
+  else if($validParsed == 4) {
+    $validParsed = 0;
+    // Get part until NEXT )
+    $remainder = substr($input, $i);
+    $next = strpos($remainder, ")");
+    if($next == false || $next > 7) {
+    } else {
+      $nums[] = substr($input, $i, $next);
+    }
+  }
+  else {
+    echo "No match for " . $arr[$i] . "\n";
+    $validParsed = 0;
+  }
+}
+
+$muls = [];
+foreach($nums as $mul) {
+  $x = explode(",", $mul);
+  $muls[] = $x;
+}
+
+$total = 0;
+foreach($muls as $mul) {
+  $total += (int)$mul[0] * (int)$mul[1];
+}
+
+var_dump($total);
+
+
+
+

aoc2024/src/days/day3_part2.php

@@ -0,0 +1,87 @@
+<?php
+$loadFrom = "../../inputs/3/input.txt";
+
+if(!file_exists($loadFrom)) {
+  echo "Missing $loadFrom\n";
+  exit(1);
+}
+
+$input = file_get_contents($loadFrom);
+
+$lookForMul = "mul(";
+$lookForMul = str_split($lookForMul);
+$lookForDont = "don't()";
+$lookForDont = str_split($lookForDont);
+$lookForDo = "do()";
+$lookForDo = str_split($lookForDo);
+$arr = str_split($input);
+
+$parsed = "";
+$valid = true;
+
+$validParsedMul = 0;
+$validParsedDont = 0;
+$validParsedDo = 0;
+$nums = [];
+$parsing = true;
+for($i = 0; $i < count($arr); $i++) {
+  if(@$lookForDo[$validParsedDo] == $arr[$i]) {
+    $validParsedDo++;
+    echo "Match for vDo $validParsedDo - " . $arr[$i] . "\n";
+  } // Whole part has matched this far
+  else if($validParsedDo == 4) {
+    $parsing = true;
+    echo "Start parsing\n";
+    $validParsedDo = 0;
+  } else {
+    $validParsedDo = 0;
+  }
+  if(@$lookForDont[$validParsedDont] == $arr[$i]) {
+    $validParsedDont++;
+    echo "Match for vDont $validParsedDont - " . $arr[$i] . "\n";
+  } // Whole part has matched this far
+  else if($validParsedDont == 7) {
+    $parsing = false;
+    echo "Stop parsing\n";
+    $validParsedDont = 0;
+  }
+  else {
+    $validParsedDont = 0;
+  }
+  if($parsing) {
+  if(@$lookForMul[$validParsedMul] == $arr[$i]) {
+    $validParsedMul++;
+    echo "Match for $validParsedMul - " . $arr[$i] . "\n";
+  } // Whole part has matched this far
+  else if($validParsedMul == 4) {
+    $validParsedMul = 0;
+    $remainder = substr($input, $i);
+    $next = strpos($remainder, ")");
+    if($next == false || $next > 7) {
+    } else {
+      $nums[] = substr($input, $i, $next);
+    }
+  }
+  else {
+    echo "No match for mul " . $arr[$i] . "\n";
+    $validParsedMul = 0;
+  }
+  }
+}
+
+$muls = [];
+foreach($nums as $mul) {
+  $x = explode(",", $mul);
+  $muls[] = $x;
+}
+
+$total = 0;
+foreach($muls as $mul) {
+  $total += (int)$mul[0] * (int)$mul[1];
+}
+
+var_dump($total);
+
+
+
+