function wpcf7_convert_to_cpt($new_ver, $old_ver)
{
    global $wpdb;
    if (!version_compare($old_ver, '3.0-dev', '<')) {
        return;
    }
    $old_rows = array();
    $table_name = $wpdb->prefix . "contact_form_7";
    if ($wpdb->get_var("SHOW TABLES LIKE '{$table_name}'")) {
        $old_rows = $wpdb->get_results("SELECT * FROM {$table_name}");
    } elseif (($opt = get_option('wpcf7')) && !empty($opt['contact_forms'])) {
        foreach ((array) $opt['contact_forms'] as $key => $value) {
            $old_rows[] = (object) array_merge($value, array('cf7_unit_id' => $key));
        }
    }
    foreach ((array) $old_rows as $row) {
        $q = "SELECT post_id FROM {$wpdb->postmeta} WHERE meta_key = '_old_cf7_unit_id'" . $wpdb->prepare(" AND meta_value = %d", $row->cf7_unit_id);
        if ($wpdb->get_var($q)) {
            continue;
        }
        $postarr = array('post_type' => 'wpcf7_contact_form', 'post_status' => 'publish', 'post_title' => maybe_unserialize($row->title));
        $post_id = wp_insert_post($postarr);
        if ($post_id) {
            update_post_meta($post_id, '_old_cf7_unit_id', $row->cf7_unit_id);
            $metas = array('form', 'mail', 'mail_2', 'messages', 'additional_settings');
            foreach ($metas as $meta) {
                update_post_meta($post_id, '_' . $meta, wpcf7_normalize_newline_deep(maybe_unserialize($row->{$meta})));
            }
        }
    }
}

 public function save()
 {
     $props = $this->get_properties();
     $post_content = implode("\n", wpcf7_array_flatten($props));
     if ($this->initial()) {
         $post_id = wp_insert_post(array('post_type' => self::post_type, 'post_status' => 'publish', 'post_title' => $this->title, 'post_content' => trim($post_content)));
     } else {
         $post_id = wp_update_post(array('ID' => (int) $this->id, 'post_status' => 'publish', 'post_title' => $this->title, 'post_content' => trim($post_content)));
     }
     if ($post_id) {
         foreach ($props as $prop => $value) {
             update_post_meta($post_id, '_' . $prop, wpcf7_normalize_newline_deep($value));
         }
         if (wpcf7_is_valid_locale($this->locale)) {
             update_post_meta($post_id, '_locale', $this->locale);
         }
         if ($this->initial()) {
             $this->id = $post_id;
             do_action('wpcf7_after_create', $this);
         } else {
             do_action('wpcf7_after_update', $this);
         }
         do_action('wpcf7_after_save', $this);
     }
     return $post_id;
 }

 function save()
 {
     $postarr = array('ID' => (int) $this->id, 'post_type' => 'wpcf7_contact_form', 'post_status' => 'publish', 'post_title' => $this->title);
     $post_id = wp_insert_post($postarr);
     if ($post_id) {
         $metas = array('form', 'mail', 'mail_2', 'messages', 'additional_settings');
         foreach ($metas as $meta) {
             update_post_meta($post_id, $meta, wpcf7_normalize_newline_deep($this->{$meta}));
         }
         if ($this->initial) {
             $this->initial = false;
             $this->id = $post_id;
             do_action_ref_array('wpcf7_after_create', array(&$this));
         } else {
             do_action_ref_array('wpcf7_after_update', array(&$this));
         }
         do_action_ref_array('wpcf7_after_save', array(&$this));
     }
     return $post_id;
 }

function wpcf7_normalize_newline_deep($arr, $to = "\n")
{
    if (is_array($arr)) {
        $result = array();
        foreach ($arr as $key => $text) {
            $result[$key] = wpcf7_normalize_newline_deep($text, $to);
        }
        return $result;
    }
    return wpcf7_normalize_newline($arr, $to);
}

 function save()
 {
     $metas = array('form', 'mail', 'mail_2', 'messages', 'additional_settings');
     $post_content = '';
     foreach ($metas as $meta) {
         $props = (array) $this->{$meta};
         foreach ($props as $prop) {
             $post_content .= "\n" . trim($prop);
         }
     }
     if ($this->initial) {
         $post_id = wp_insert_post(array('post_type' => self::post_type, 'post_status' => 'publish', 'post_title' => $this->title, 'post_content' => trim($post_content)));
     } else {
         $post_id = wp_update_post(array('ID' => (int) $this->id, 'post_status' => 'publish', 'post_title' => $this->title, 'post_content' => trim($post_content)));
     }
     if ($post_id) {
         foreach ($metas as $meta) {
             update_post_meta($post_id, $meta, wpcf7_normalize_newline_deep($this->{$meta}));
         }
         if ($this->initial) {
             $this->initial = false;
             $this->id = $post_id;
             do_action_ref_array('wpcf7_after_create', array(&$this));
         } else {
             do_action_ref_array('wpcf7_after_update', array(&$this));
         }
         do_action_ref_array('wpcf7_after_save', array(&$this));
     }
     return $post_id;
 }