User redirect to destination URL after login

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I did something similar recently.

1. If the user is not logged in I captured the desired/destination page’s URL and added it as a query arg to the login page’s URL.

2. Redirect the user to the login page.

function wpa_59205_redirect(){
    global $post;
    if ( ! is_user_logged_in() ) {
                // this will tack on the current page's url as a query arg for the login page's url
        $redirect = add_query_arg( 'redirect_to', get_permalink( $post->ID ), $url_of_your_login_page_here );
                // redirect to the login page
        wp_redirect( $redirect );
        exit();
    }
}
add_action( 'template_redirect', 'wpa_59205_redirect' );

3. Then you can filter the URL that the user is redirected to after login, using the login_redirect filter. Simply check for the presence of your previously added query var:

function wpa_59205_login_redirect( $redirect_to ){
    if( isset( $_REQUEST['redirect_to'] ) ) {
        return $_REQUEST['redirect_to'];
    } else {
        return $redirect_to;
    }
}
add_filter( 'login_redirect', 'wpa_59205_login_redirect');

I did this with a WooCommerce login page, so I was filtering their proprietary login redirect filter, but login_redirect is the WP default version of the same so I think it should work, but haven’t tested it.

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