PHP CTDL_Lib::install_plugin示例

/**
 * Install plugin on plugin activation
 */
function cleverness_todo_activation()
{
    global $wp_version;
    $exit_msg = __('To-Do List requires WordPress 3.8 or newer. <a href="http://codex.wordpress.org/Upgrading_WordPress">Please update.</a>', 'cleverness-to-do-list');
    if (version_compare($wp_version, '3.8', '<')) {
        exit($exit_msg);
    }
    if (!defined('CTDL_DB_VERSION')) {
        define('CTDL_DB_VERSION', '3.4');
    }
    if (!defined('CTDL_FILE')) {
        define('CTDL_FILE', __FILE__);
    }
    include_once 'includes/cleverness-to-do-list-library.class.php';
    if (get_option('CTDL_db_version')) {
        $installed_ver = get_option('CTDL_db_version');
    } else {
        $installed_ver = 0;
    }
    if (CTDL_DB_VERSION != $installed_ver) {
        CTDL_Lib::install_plugin();
    }
}