With APCu 5+, use apcu_* function to examine cache state

Summary: Ref T9640. APCu 5.0+ (for PHP7) uses `apcu_*` functions instead of `apc_` functions. Test for function existence and call the appropriate functions.

Test Plan: {F2352695}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9640

Differential Revision: https://secure.phabricator.com/D17198

Author: epriestley

src/applications/cache/spec/PhabricatorDataCacheSpec.php

@@ -79,28 +79,40 @@ private function initNoneSpec() {
   }
 
   private function initAPCCommonSpec() {
-    $mem = apc_sma_info();
-    $this->setTotalMemory($mem['num_seg'] * $mem['seg_size']);
+    $state = array();
 
-    $info = apc_cache_info('user');
-    $this->setUsedMemory($info['mem_size']);
-    $this->setEntryCount(count($info['cache_list']));
+    if (function_exists('apcu_sma_info')) {
+      $mem = apcu_sma_info();
+      $info = apcu_cache_info();
+    } else if (function_exists('apc_sma_info')) {
+      $mem = apc_sma_info();
+      $info = apc_cache_info('user');
+    } else {
+      $mem = null;
+    }
 
-    $cache = $info['cache_list'];
-    $state = array();
-    foreach ($cache as $item) {
-      $info = idx($item, 'info', '<unknown-key>');
-      $key = self::getKeyPattern($info);
-      if (empty($state[$key])) {
-        $state[$key] = array(
-          'max' => 0,
-          'total' => 0,
-          'count' => 0,
-        );
+    if ($mem) {
+      $this->setTotalMemory($mem['num_seg'] * $mem['seg_size']);
+
+      $this->setUsedMemory($info['mem_size']);
+      $this->setEntryCount(count($info['cache_list']));
+
+      $cache = $info['cache_list'];
+      $state = array();
+      foreach ($cache as $item) {
+        $info = idx($item, 'info', '<unknown-key>');
+        $key = self::getKeyPattern($info);
+        if (empty($state[$key])) {
+          $state[$key] = array(
+            'max' => 0,
+            'total' => 0,
+            'count' => 0,
+          );
+        }
+        $state[$key]['max'] = max($state[$key]['max'], $item['mem_size']);
+        $state[$key]['total'] += $item['mem_size'];
+        $state[$key]['count']++;
       }
-      $state[$key]['max'] = max($state[$key]['max'], $item['mem_size']);
-      $state[$key]['total'] += $item['mem_size'];
-      $state[$key]['count']++;
     }
 
     $this->setCacheSummary($state);