_real_escape example

    public function _escape( $data ) {
        if ( is_array( $data ) ) {
            foreach ( $data as $k => $v ) {
                if ( is_array( $v ) ) {
                    $data[ $k ] = $this->_escape( $v );
                } else {
                    $data[ $k ] = $this->_real_escape( $v );
                }
            }
        } else {
            $data = $this->_real_escape( $data );
        }

        return $data;
    }

    /** * Do not use, deprecated. * * Use esc_sql() or wpdb::prepare() instead. * * @since 0.71 * @deprecated 3.6.0 Use wpdb::prepare() * @see wpdb::prepare() * @see esc_sql() * * @param string|array $data Data to escape. * @return string|array Escaped data, in the same type as supplied. */