// Функция создания таблицы в БД если она отсутствует
function create_table() {
	global $wpdb;

	require_once ABSPATH . 'wp-admin/includes/upgrade.php';

	$table_name = $wpdb->get_blog_prefix() . 'applications';
	$charset_collate = "DEFAULT CHARACTER SET {$wpdb->charset} COLLATE {$wpdb->collate}";

	if($wpdb->get_var("SHOW TABLES LIKE '$table_name'") != $table_name) {
		$sql = "CREATE TABLE {$table_name} (
		id int NOT NULL auto_increment,
		name varchar(30) NOT NULL default '',
		email varchar(100) NOT NULL UNIQUE,
		phone varchar(11) NOT NULL default '',
		message text NOT NULL default '',
		product_id int NOT NULL default '',
		status int NOT NULL default '',
		comment text NOT NULL default '',
		created_at datetime NOT NULL default '',
		updated_at datetime NOT NULL default '',
		PRIMARY KEY  (id)
		)
		{$charset_collate};";

		dbDelta($sql);
	}
}

create_table();