codeigniter与php5.6的兼容问题，codeigniterphp5.6错误提示：
a php error was encounteredseverity: noticemessage: only variable references should be returned by referencefilename: core/common.phpline number: 257
原代码：
return $_config[0] =& $config;
修改后:
$_config[0] =& $config;return $_config[0];
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