CodeIgniter与PHP5.6的兼容问题，codeigniterphp5.6_PHP教程

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

原代码：

return $_config[0] =& $config;

修改后:

$_config[0] =& $config;
return $_config[0];

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