CodeIgniter与PHP5.6的兼容问题，codeigniterphp5.6
错误提示：
A PHP Error was encountered
Severity: Notice
Message: Only variable references should be returned by reference
Filename: core/Common.php
Line Number: 257
Salin selepas log masuk
原代码：
return $_config[0] =& $config;
Salin selepas log masuk
修改后:
$_config[0] =& $config;
return $_config[0];
Salin selepas log masuk
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