Only variable references should be returned by reference

Only variable references should be returned by reference 搭建完Lepus监控系统后，界面提示错误： A PHP Error was encountered Severity: Notice Message: Only variable references should be returned by reference Filename: core/Common.php Line Number: 257 [root@b77-11-100 lepus_v3.7]# find / -name Common.php /opt/lampp/htdocs/system/core/Common.php 修改如下内容 return $_config[0] =& $config; 为  $_config[0] =& $config;  return $_config[0];