Use global Constant

Protocols/Http.php

@@ -723,4 +723,4 @@ class HttpCache
 
 HttpCache::init();
 
-define('NO_CLI', PHP_SAPI !== 'cli');
+define('NO_CLI', \PHP_SAPI !== 'cli');

Worker.php

@@ -542,7 +542,7 @@ class Worker
     protected static function checkSapiEnv()
     {
         // Only for cli.
-        if (PHP_SAPI !== 'cli') {
+        if (\PHP_SAPI !== 'cli') {
             exit("Only run in command line mode \n");
         }
         if (DIRECTORY_SEPARATOR === '\\') {