Merge pull request #326 from zqhong/patch-1

Typo: linx -> linux

Worker.php

@@ -1836,7 +1836,7 @@ class Worker
     public static function checkErrors()
     {
         if (static::STATUS_SHUTDOWN != static::$_status) {
-            $error_msg = static::$_OS === 'linx' ? 'Worker['. posix_getpid() .'] process terminated' : 'Worker process terminated';
+            $error_msg = static::$_OS === 'linux' ? 'Worker['. posix_getpid() .'] process terminated' : 'Worker process terminated';
             $errors    = error_get_last();
             if ($errors && ($errors['type'] === E_ERROR ||
                     $errors['type'] === E_PARSE ||