GridView.php
public function evaluateExpression($_expression_, $_data_) {
        // debug($_data_);
        // debug($_expression_);
        // die;
        if (is_string($_expression_)) {
            extract($_data_);
            return eval('return '.$_expression_.';');
        } else {
            $_data_[]=$this;
            return call_user_func_array($_expression_, $_data_);
        }
    }
public function evaluateExpression($_expression_, $_data_) {
        // debug($_data_);
        // debug($_expression_);
        // die;
        if (is_string($_expression_)) {
            extract($_data_);
            return eval('return '.$_expression_.';');
        } else {
            $_data_[]=$this;
            return call_user_func_array($_expression_, $_data_);
        }
    }
Evaluates a PHP expression.

@param mixed $_expression_ a PHP expression or PHP callback to be evaluated.
@param array $_data_ additional parameters to be passed to the above expression/callback.
@return mixed the expression result