Update the getStats() function for zend memory cache

Author: hammermaps

src/phpFastCache/Drivers/Zendshm/Driver.php

@@ -130,11 +130,20 @@ protected function driverConnect()
      */
     public function getStats()
     {
-        $stats = (array) zend_shm_cache_info();
-        return (new driverStatistic())
-            ->setData(implode(', ', array_keys($this->namespaces)))
-            ->setInfo(sprintf("The Zend memory have %d item(s) in cache.\n For more information see RawData.",$stats[ 'items_total' ]))
-            ->setRawData($stats)
-            ->setSize($stats[ 'memory_total' ]);
+        if(function_exists('zend_shm_cache_info')) {
+            $stats = (array)zend_shm_cache_info();
+            return (new driverStatistic())
+                ->setData(implode(', ', array_keys($this->namespaces)))
+                ->setInfo(sprintf("The Zend memory have %d item(s) in cache.\n For more information see RawData.", $stats['items_total']))
+                ->setRawData($stats)
+                ->setSize($stats['memory_total']);
+        } else {
+            /** zend_shm_cache_info supported V8 or higher */
+            return (new driverStatistic())
+                ->setData(implode(', ', array_keys($this->namespaces)))
+                ->setInfo("The Zend memory statistics is only supported by ZendServer V8 or higher")
+                ->setRawData(null)
+                ->setSize(0);
+        }
     }
 }