Unable to execute script after contact form 7 submit

When I execute this code it doesn’t do anything except there comes up a spinning icon underneath the contact form wich spins forever.

add_action( 'wpcf7_before_send_mail', 'process_contact_form_data' );

function process_contact_form_data( $contact_data ){

var_dump($contact_data->posted_data);
        $name = $contact_data->posted_data["your-name"];
        $email = $contact_data->posted_data["your-email"];

echo $name ;
echo $email; }