taniagreen

/// userPage.php ///
// define your parameters
$post_id = get_the_ID() ?? null;
$post_title = get_the_title() ?? '';

// add parameters as data-* attributes
return "<div data-post-id={$post_id} data-post-title={$post_title} class=\"userApp\"></div>";


/// App.jsx ///

taniagreen

/// user.php ///

// initialize global variable in a script added to your php file
<script>
    window.reactData = {
        postId: <?php echo get_the_id(); ?>
    };
</script>