A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257

原代码：

return $_config[0] =& $config;

修改后:

$_config[0] =& $config;

return $_config[0];

参考：
http://stackoverflow.com/questions/28348879/only-variable-references-should-be-returned-by-reference-codeigniter

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