1 files changed, 7 insertions, 3 deletions
diff --git a/lib/private/Cache/CappedMemoryCache.php b/lib/private/Cache/CappedMemoryCache.php
index 408c3935ffb..584a53f0ff2 100644
--- a/lib/private/Cache/CappedMemoryCache.php
+++ b/lib/private/Cache/CappedMemoryCache.php
@@ -63,19 +63,23 @@ class CappedMemoryCache implements ICache, \ArrayAccess {
 		return true;
 	}
 
-	public function offsetExists($offset) {
+	public function offsetExists($offset): bool {
 		return $this->hasKey($offset);
 	}
 
+	/**
+	 * @return mixed
+	 */
+	#[\ReturnTypeWillChange]
 	public function &offsetGet($offset) {
 		return $this->cache[$offset];
 	}
 
-	public function offsetSet($offset, $value) {
+	public function offsetSet($offset, $value): void {
 		$this->set($offset, $value);
 	}
 
-	public function offsetUnset($offset) {
+	public function offsetUnset($offset): void {
 		$this->remove($offset);
 	}