[Reprint] Compatibility issues between CodeIgniter and PHP5.6, codeigniterphp5.6_PHP tutorial

[Repost] Compatibility issues between CodeIgniter and PHP5.6, codeigniterphp5.6

Error message:

A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257

Original code:

return $_config[0] =& $config;

After modification:

$_config[0] =& $config;

return $_config[0];

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