diff --git a/05/part1.php b/05/part1.php
index 01ea8fc..9f73b3b 100644
--- a/05/part1.php
+++ b/05/part1.php
@@ -6,14 +6,14 @@ $input = array_map(fn($line) => explode(',', str_replace(' -> ', ',', $line)), $
 $map = array_fill(0, 1000, array_fill(0, 1000, 0));
 
 foreach ($input as $coordinates) {
-    if ($coordinates[0] == $coordinates[2]) {
+    if ($coordinates[0] === $coordinates[2]) {
         $start = min([$coordinates[1], $coordinates[3]]);
         $end = max([$coordinates[1], $coordinates[3]]);
         for ($i = $start; $i <= $end; $i++) {
             $map[$coordinates[0]][$i]++;
         }
     }
-    if ($coordinates[1] == $coordinates[3]) {
+    if ($coordinates[1] === $coordinates[3]) {
         $start = min([$coordinates[0], $coordinates[2]]);
         $end = max([$coordinates[0], $coordinates[2]]);
         for ($i = $start; $i <= $end; $i++) {
diff --git a/05/part2.php b/05/part2.php
new file mode 100644
index 0000000..a841420
--- /dev/null
+++ b/05/part2.php
@@ -0,0 +1,35 @@
+<?php
+echo '<pre>';
+$input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+$input = array_map(fn($line) => explode(',', str_replace(' -> ', ',', $line)), $input);
+
+$map = array_fill(0, 1000, array_fill(0, 1000, 0));
+
+foreach ($input as $coordinates) {
+    if ($coordinates[0] === $coordinates[2]) {
+        $start = min([$coordinates[1], $coordinates[3]]);
+        $end = max([$coordinates[1], $coordinates[3]]);
+        for ($i = $start; $i <= $end; $i++) {
+            $map[$coordinates[0]][$i]++;
+        }
+    }
+    if ($coordinates[1] === $coordinates[3]) {
+        $start = min([$coordinates[0], $coordinates[2]]);
+        $end = max([$coordinates[0], $coordinates[2]]);
+        for ($i = $start; $i <= $end; $i++) {
+            $map[$i][$coordinates[1]]++;
+        }
+    }
+    if ($coordinates[0] !== $coordinates[2] && $coordinates[1] !== $coordinates[3]) {
+        $startx = $start = min([$coordinates[0], $coordinates[2]]);
+        $endx = max([$coordinates[0], $coordinates[2]]);
+        $starty = $startx === $coordinates[0] ? $coordinates[1] : $coordinates[3];
+        $endy = $startx === $coordinates[2] ? $coordinates[1] : $coordinates[3];
+        $slope = $starty > $endy ? -1 : 1;
+        for ($i = $startx, $step = 0; $i <= $endx; $i++, $step++) {
+            $map[$i][$starty + ($step * $slope)]++;
+        }
+    }
+}
+echo count(array_filter(call_user_func_array('array_merge', $map), fn($el) => $el > 1)); //22213
+