From cf22b9f72d7d18b6436fba8c968169c4c81b0dcb Mon Sep 17 00:00:00 2001
From: Christian Stocker <me@chregu.tv>
Date: Mon, 26 Feb 2024 11:44:22 +0100
Subject: [PATCH] fix deprecated string

---
 src/Rokka.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Rokka.php b/src/Rokka.php
index 6426c56..e64e1d4 100644
--- a/src/Rokka.php
+++ b/src/Rokka.php
@@ -161,8 +161,8 @@ public static function getStackUrl(string $operation, File $file, $width, $heigh
     if ($extension == 'svg') {
       $format = $extension;
     }
-    if (isset($stacks["${operation}-${width}x${height}"])) {
-      $stack = $stacks["${operation}-${width}x${height}"];
+    if (isset($stacks["{$operation}-{$width}x{$height}"])) {
+      $stack = $stacks["{$operation}-{$width}x{$height}"];
     } else {
       // check if we have a stack configuration for this variable with w setting, then we can use the shorter URLs.
       $config = self::getStackConfiguration($operation, $operation);