Using Smart Tags in Your WordPress Rewrite Rules

/**

 * Using Smart Tags in WordPress rewrite rules

 *

 * @link https://wpforms.com/developers/how-to-use-smart-tags-in-your-wordpress-rewrite-rules/

 */

// Register custom query var

function register_query_var( $wp ) {

    parse_str( $wp->matched_query, $url );

    if ( ! isset( $url[ 'email_address' ] ) ) {

        return;

    }

    $wp->set_query_var( 'email_address', $url[ 'email_address' ] );

}

add_filter( 'parse_request', 'register_query_var', 9, 1 );

// Replace query var in WPForms smat tags

function my_process_smart_tags( $content ) {

    // Query string var smart tags.

    preg_match_all( "/\{query_var key=\"(.+?)\"\}/", $content, $query_vars );

    if ( ! empty( $query_vars[1] ) ) {

        foreach ( $query_vars[1] as $key => $query_var ) {

            $value   = get_query_var( $query_var ); // phpcs:ignore

            $content = str_replace( $query_vars[0][ $key ], strip_shortcodes( $value ), $content );

        }

    }

    return $content;

}

add_filter( 'wpforms_process_smart_tags', 'my_process_smart_tags', 9, 1 );