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lib/PhpSpreadsheet/Collection/Memory/SimpleCache3.php

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+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Collection\Memory;
+
+use DateInterval;
+use Psr\SimpleCache\CacheInterface;
+
+/**
+ * This is the default implementation for in-memory cell collection.
+ *
+ * Alternative implementation should leverage off-memory, non-volatile storage
+ * to reduce overall memory usage.
+ */
+class SimpleCache3 implements CacheInterface
+{
+    private array $cache = [];
+
+    public function clear(): bool
+    {
+        $this->cache = [];
+
+        return true;
+    }
+
+    public function delete(string $key): bool
+    {
+        unset($this->cache[$key]);
+
+        return true;
+    }
+
+    public function deleteMultiple(iterable $keys): bool
+    {
+        foreach ($keys as $key) {
+            $this->delete($key);
+        }
+
+        return true;
+    }
+
+    public function get(string $key, mixed $default = null): mixed
+    {
+        if ($this->has($key)) {
+            return $this->cache[$key];
+        }
+
+        return $default;
+    }
+
+    public function getMultiple(iterable $keys, mixed $default = null): iterable
+    {
+        $results = [];
+        foreach ($keys as $key) {
+            $results[$key] = $this->get($key, $default);
+        }
+
+        return $results;
+    }
+
+    public function has(string $key): bool
+    {
+        return array_key_exists($key, $this->cache);
+    }
+
+    public function set(string $key, mixed $value, null|int|DateInterval $ttl = null): bool
+    {
+        $this->cache[$key] = $value;
+
+        return true;
+    }
+
+    public function setMultiple(iterable $values, null|int|DateInterval $ttl = null): bool
+    {
+        foreach ($values as $key => $value) {
+            $this->set($key, $value);
+        }
+
+        return true;
+    }
+}