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Continue to ChatCodeigniter: Only variable references should be returned by reference https://developersushant.wordpress.com/2016/08/30/codeigniter-only-variable-references-should-be-returned-by-reference/
Codeigniter: Only variable references should be returned by reference https://developersushant.wordpress.com/2016/08/30/codeigniter-only-variable-references-should-be-returned-by-reference/