13th day both parts

13/part2.php

@@ -0,0 +1,61 @@
+<?php
+
+$input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+$coordinates = $coordinatesPrint = [];
+$folds       = [];
+
+foreach ($input as $line) {
+    if (strstr($line, 'fold')) {
+        preg_match('#fold along ([x|y])=(\d*)#', $line, $found);
+        $folds[] = [$found[1], (int)$found[2]];
+    } else {
+        $point         = explode(',', $line);
+        $coordinates[] = $point;
+    }
+}
+
+foreach ($folds as $fold) {
+    foreach ($coordinates as &$point) {
+        if ($fold[0] == 'x' && $point[0] > $fold[1]) {
+            $point[0] = $fold[1] * 2 - $point[0];
+        }
+        if ($fold[0] == 'y' && $point[1] > $fold[1]) {
+            $point[1] = $fold[1] * 2 - $point[1];
+        }
+    }
+    $coordinates = points_unique($coordinates);
+}
+
+printImage($coordinates); // PGHRKLKL
+
+
+function points_unique($coordinates)
+{
+    $tmp            = [];
+    $newCoordinates = [];
+    foreach ($coordinates as $point) {
+        if (!isset($tmp[implode(',', $point)])) {
+            $newCoordinates[]          = $point;
+            $tmp[implode(',', $point)] = 1;
+        }
+    }
+    return $newCoordinates;
+}
+
+function printImage($coordinates)
+{
+    $maxx = $maxy = 0;
+    foreach ($coordinates as $point) {
+        if ($point[0] > $maxx) {
+            $maxx = $point[0];
+        }
+        if ($point[1] > $maxy) {
+            $maxy = $point[1];
+        }
+    }
+    $image = array_fill(0, $maxy + 1, array_fill(0, $maxx + 1, ' '));
+    foreach ($coordinates as $point) {
+        $image[$point[1]][$point[0]] = '#';
+    }
+    echo implode("\n", array_map(fn($line) => implode('', $line), $image));
+}