//contact form 7 submissions create user
function create_user_from_registration($cfdata) {

        //setup submission object
        $submission = WPCF7_Submission::get_instance();
        $formdata = $submission->get_posted_data();
    if ( $cfdata->title() == 'Registration Form_copy') {

        //submitted fields
        $email = $formdata['email'];
        $first_name = $formdata['firstname'];
        $surname = $formdata['surname'];
        $full_name = $first_name . ' ' . $surname;
        $programme = $formdata['prog_name'];
        $programme_id = $formdata['prog_id'];
        $programme_end = $formdata['prog_date'];
        $password = $first_name.'_'.$surname.'_'.$programme_end;
        $coach = $formdata['tname'];

        // Construct a username from the user's name
        $username = $full_name;

        if ( !email_exists( $email ) ) {
            // Find an unused username
            $username_tocheck = $username;
            $i = 1;
            while ( username_exists( $username_tocheck ) ) {
                $username_tocheck = $username . ' ' .  $i++;
            }
            $username = $username_tocheck;

            // Create the user
            $userdata = array(
                'user_login' => $username,
                'user_pass' => $password,
                'user_email' => $email,
                'nickname' => $first_name,
                'display_name' => $full_name,
                'first_name' => $first_name,
                'last_name' => $surname,
                'role' => 'subscriber'
            );

            $user_id = wp_insert_user( $userdata );

            //add programme meta
            // programme name
            add_user_meta( $user_id,'programme', $programme );

            // programme id
             add_user_meta( $user_id,'programme_id', $programme_id );

            //end date meta
            add_user_meta( $user_id,'programme_end_date', $programme_end );

            update_field('coach', $coach, 'user_'.$user_id);

            if ( !is_wp_error($user_id) ) {
                // Email login details to user
                $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
                $message = sprintf(__('Thank you for sigining up for the Dialogix Programme - %s.'), $programme) . "\r\n";
                $message .= "One of our team will be in touch shortly to discuss the next steps." . "\r\n" . "You will need the following login details to access our online course" . "\r\n";
                $message .= sprintf(__('Username: %s'), $username) . "\r\n";
                $message .= sprintf(__('Password: %s'), $password) . "\r\n";
                $message .= wp_login_url() . "\r\n";
                wp_mail(xxxx@xxxx', sprintf(__('Thank you for registering for a %s progamme.'), $blogname), $message);
            }
        }
    }
    return $cfdata;
}
add_action('wpcf7_before_send_mail', 'create_user_from_registration', 1);