diff --git a/src/applications/cache/spec/PhabricatorCacheSpec.php b/src/applications/cache/spec/PhabricatorCacheSpec.php
--- a/src/applications/cache/spec/PhabricatorCacheSpec.php
+++ b/src/applications/cache/spec/PhabricatorCacheSpec.php
@@ -79,6 +79,9 @@
   }
 
   protected function raiseInstallAPCIssue() {
+    if (version_compare(phpversion(), '7', '>=')) {
+      return;
+    }
     $message = pht(
       "Installing the PHP extension 'APC' (Alternative PHP Cache) will ".
       "dramatically improve performance. Note that APC versions 3.1.14 and ".
diff --git a/src/applications/cache/spec/PhabricatorDataCacheSpec.php b/src/applications/cache/spec/PhabricatorDataCacheSpec.php
--- a/src/applications/cache/spec/PhabricatorDataCacheSpec.php
+++ b/src/applications/cache/spec/PhabricatorDataCacheSpec.php
@@ -61,7 +61,7 @@
   }
 
   private function initNoneSpec() {
-    if (version_compare(phpversion(), '5.5', '>=')) {
+    if (version_compare(phpversion(), '5.5', '>=') && version_compare(phpversion(), '7', '<')) {
       $message = pht(
         'Installing the "APCu" PHP extension will improve performance. '.
         'This extension is strongly recommended. Without it, Phabricator '.
diff --git a/src/applications/cache/spec/PhabricatorOpcodeCacheSpec.php b/src/applications/cache/spec/PhabricatorOpcodeCacheSpec.php
--- a/src/applications/cache/spec/PhabricatorOpcodeCacheSpec.php
+++ b/src/applications/cache/spec/PhabricatorOpcodeCacheSpec.php
@@ -188,7 +188,7 @@
   }
 
   private function initNoneSpec() {
-    if (version_compare(phpversion(), '5.5', '>=')) {
+    if (version_compare(phpversion(), '5.5', '>=') && version_compare(phpversion(), '7', '<')) {
       $message = pht(
         'Installing the "Zend OPcache" extension will dramatically improve '.
         'performance.');