Resize image after upload using imagine

src/Service/PhotoResizer.php

@@ -0,0 +1,37 @@
+<?php
+
+// Source: https://symfony.com/doc/current/the-fast-track/en/23-imagine.html
+
+namespace App\Service;
+
+use Imagine\Gd\Imagine;
+use Imagine\Image\Box;
+
+class PhotoResizer
+{
+    private const MAX_WIDTH = 1000;
+    private const MAX_HEIGHT = 1000;
+
+    private $imagine;
+
+    public function __construct()
+    {
+        $this->imagine = new Imagine();
+    }
+
+    public function resize(string $filename): void
+    {
+        list($iwidth, $iheight) = getimagesize($filename);
+        $ratio = $iwidth / $iheight;
+        $width = self::MAX_WIDTH;
+        $height = self::MAX_HEIGHT;
+        if ($width / $height > $ratio) {
+            $width = $height * $ratio;
+        } else {
+            $height = $width / $ratio;
+        }
+
+        $photo = $this->imagine->open($filename);
+        $photo->resize(new Box($width, $height))->save($filename);
+    }
+}