Edit filename: core/Common.php, line number: 257

Before

return $_config[0] =& $config; 

After

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

Update

Added by NikiC

In PHP assignment expressions always return the assigned value. So $_config[0] =& $config returns $config - but not the variable itself, but a copy of its value. And returning a reference to a temporary value wouldn't be particularly useful (changing it wouldn't do anything).

Update

This fix has been merged into CI 2.2.1 (https://github.com/bcit-ci/CodeIgniter/commit/69b02d0f0bc46e914bed1604cfbd9bf74286b2e3). It's better to upgrade rather than modifying core framework files.

this has been modified in codeigniter 2.2.1...usually not best practice to modify core files, I would always check for updates and 2.2.1 came out in Jan 2015

It's not a better idea to override the core.common file of codeigniter. Because that's the more tested and system files....

I make a solution for this problem.In your ckeditor_helper.php file line- 65

if($k !== end (array_keys($data['config']))) {       $return .= ",";}

Change this to-->

 $segment = array_keys($data['config']);    if($k !== end($segment)) {           $return .= ",";    }

I think this is the best solution and then your problem notice will dissappear.