get post title with dynamic ID

I understand what you’re asking. Unfortunately, none of our built-in shortcodes can do that since you’re looking to combine two, but here’s the code you can use to get what you need:

function ayeyebrazov_get_title_by_id() {
    // Use DTX helper function to get the value of "fid" from $_GET
    $post_id = wpcf7dtx_get(array('key' => 'fid'));

    // Use DTX helper function to get the title of the post ID and return that
    return wpcf7dtx_get_post_var(array('key' => 'post_title', 'post_id' => $post_id ));
}
add_shortcode('ayeyebrazov_get_title_by_id', 'ayeyebrazov_get_title_by_id');

And then in your form template, you can use your custom shortcode like this:

[dynamic_text inputname "ayeyebrazov_get_title_by_id"]

This code has not yet been tested as I wrote it directly in this reply ??

thank you very much;
as a fast workaround, without php (deadlines!), in this case i resolved opening the form in a modal and retrieving the title in the simple way [CF7_get_post_var key=’post_title’ ] .
but i’ll save this solution and test it for future needs.
thanks for your support!

Sounds great! My apologies for the delay, I totally understand deadlines. June is just a busy month for me—lots of volunteering at events!