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<?php
// Get date from Contact Form 7 before email send
add_action("wpcf7_before_send_mail", "wpcf7_save_data");
function wpcf7_save_data(&$wpcf7_data) {

  // Here is the variable where the data are stored!
  $user_nume = $wpcf7_data->posted_data['user_nume'];
  $user_email = $wpcf7_data->posted_data['user_email'];
  // Set the cookies
  setcookie('os_username', $user_nume, time() + (10*365*24*60*60));
  setcookie('os_useremail', $user_email, time() + (10*365*24*60*60));
  
  // If you want to skip mailing the data, you can do it...
  //$wpcf7_data->skip_mail = true;

}

// Populate Contact Form 7 hidden fields
add_filter('wpcf7_hidden_field_value_hidden_nume', 'wpcf7_hidden_field_add_query_nume');
function wpcf7_hidden_field_add_query_nume($value = '') {
  if ($_COOKIE['os_username']) {
    return $_COOKIE['os_username'];
  }
  return $value;
}
add_filter('wpcf7_hidden_field_value_hidden_email', 'wpcf7_hidden_field_add_query_email');
function wpcf7_hidden_field_add_query_email($value = '') {
  if ($_COOKIE['os_useremail']) {
    return $_COOKIE['os_useremail'];
  }
  return $value;
}

// Do custom shortcuts in a contact form
add_filter( 'wpcf7_form_elements', 'mycustom_wpcf7_form_elements' );
function mycustom_wpcf7_form_elements( $form ) {
  $form = do_shortcode( $form );
  
  return $form;
}
?>