public function getExists($varname, &$exists)
    {
        $exists = $this->_getExists($this->_vars, $varname, $value);
        return $value;
    }
public function getExists($varname, &$exists)
    {
        $exists = $this->_getExists($this->_vars, $varname, $value);
        return $value;
    }
public function getExists ( $ varname , & $ exists ) { $ exists = $ this -> _getExists ( $ this -> _vars , $ varname , $ value ) ; return $ value ; }
Given a variable name, returns the value and sets a variable indicating
whether the value exists in the form data.

@param string $varname   The form variable name.
@param boolean &$exists  Reference to variable that will indicate
whether $varname existed in form data.

@return mixed  The form variable, or null if it doesn't exist.
Given a variable name returns the value and sets a variable indicating whether the value exists in the form data .