Memcached fixes.

README.md

@@ -91,7 +91,7 @@ services:
 
 - PHP >= 8.2 (Use [v1 branch](https://github.com/RobiNN1/phpCacheAdmin/tree/v1.x) if you need support for >=7.4)
 - Redis server >= 3.0.0
-- Memcached server >= 1.4.31. If you do not see the keys, you need to enable `lru_crawler`. SASL is not supported because there is no way to get the keys.
+- Memcached server >= 1.4.31 (ideally >= 1.5.19 to see more data). If you do not see the keys, you need to enable `lru_crawler`. SASL is not supported because there is no way to get the keys.
 
 > It is not necessary to have all dashboards enabled.
 

src/Dashboards/Memcached/MemcachedTrait.php

@@ -112,7 +112,7 @@ private function viewKey(): string {
         }
 
         $info = $this->memcached->getKeyMeta($key);
-        $ttl = $info['exp'];
+        $ttl = $info['exp'] ?? null;
         $ttl = $ttl === 0 ? -1 : $ttl;
 
         if (isset($_GET['export'])) {
@@ -135,8 +135,8 @@ private function viewKey(): string {
         return $this->template->render('partials/view_key', [
             'key'        => $key,
             'value'      => $formatted_value,
-            'ttl'        => Format::seconds($ttl),
-            'size'       => Format::bytes($info['size']),
+            'ttl'        => $ttl ? Format::seconds($ttl) : null,
+            'size'       => isset($info['size']) ? Format::bytes($info['size']) : null,
             'encode_fn'  => $encode_fn,
             'formatted'  => $is_formatted,
             'edit_url'   => Http::queryString(['ttl'], ['form' => 'edit', 'key' => $key]),

src/Dashboards/Memcached/PHPMem.php

@@ -157,12 +157,21 @@ public function getKey(string $key): string|false {
     /**
      * Get key meta-data.
      *
+     * This command requires Memcached server >= 1.5.19
+     *
+     * @link https://github.com/memcached/memcached/wiki/ReleaseNotes1519
+     *
      * @return array<string, string|int>
      *
      * @throws MemcachedException
      */
     public function getKeyMeta(string $key): array {
         $raw = $this->runCommand('me '.$key);
+
+        if ($raw === 'ERROR') {
+            return [];
+        }
+
         $raw = preg_replace('/^ME\s+\S+\s+/', '', $raw); // Remove `ME keyname`
 
         return $this->parseLine($raw);