More fully qualified name

Worker.php

@@ -2158,8 +2158,8 @@ class Worker
 
         // Turn reusePort on.
         if (static::$_OS === OS_TYPE_LINUX  // if linux
-                            && version_compare(\PHP_VERSION,'7.0.0', 'ge') // if php >= 7.0.0
-                            && strtolower(php_uname('s')) !== 'darwin') { // if not Mac OS
+                            && \version_compare(\PHP_VERSION,'7.0.0', 'ge') // if php >= 7.0.0
+                            && \strtolower(\php_uname('s')) !== 'darwin') { // if not Mac OS
 
             $this->reusePort = true;
         }