WordPress: register_activation_hook()

Question

嗨，我正在尝试使用wordpress register_activation_hook()函数来创建插件激活中不存在的表。

当我把它放在插件主文件中(在这里我们定义了插件元)时，代码工作得很好，但是当我试图在子目录的其他文件中使用它时，它就不能工作了。我已经尝试将register_activation_hook(__FILE__, 'my_medias_db');更改为register_activation_hook(to_plugin_root_path, 'my_medias_db');，以插件根路径，但仍然无法工作。知道吗？

这里是代码

function my_medias_db() {
    require_once( ABSPATH . '/wp-admin/includes/upgrade.php' );
    global $wpdb;
    $db_table_name = $wpdb->prefix . 'my_medias';
    if( $wpdb->get_var( "SHOW TABLES LIKE '$db_table_name'" ) != $db_table_name ) {
        if ( ! empty( $wpdb->charset ) )
            $charset_collate = "DEFAULT CHARACTER SET $wpdb->charset";
        if ( ! empty( $wpdb->collate ) )
            $charset_collate .= " COLLATE $wpdb->collate";

        $sql = "CREATE TABLE " . $db_table_name . " (
            `id` int(11) NOT NULL AUTO_INCREMENT,
            `post_id` int(11) NOT NULL,
            `image_name` text NOT NULL,
            `status` tinyint(1) DEFAULT NULL,
            PRIMARY KEY (`id`)
        ) $charset_collate;";
        dbDelta( $sql );
    }
}
register_activation_hook(__FILE__, 'my_medias_db');

Answer 1

上面的代码是否在主插件索引文件中？

如果不是，那就是你的问题了。如果您查看wp代码，activation_hook调用依赖于插件索引文件的$file参数，因此如果您从另一个文件调用register_activation_hook，请尝试如下所示(这是一个OO示例)

...snip...

    $strPluginFilename = $this->getMainPluginFilename();
    // rcarver - the activation hook calls rely on the file name being the plugin index!
    register_activation_hook($strPluginFilename, array($this, 'baseActivate') );
    register_deactivation_hook($strPluginFilename, array($this, 'baseDeactivate') );

...snip...

protected function getMainPluginFilename() {
    // eg. /some/place/wp-content/plugins/my_cool_plugin/pluginbase.php will
    // result in the base file name of  "my_cool_plugin.php"
    // NOTE: THIS ONLY WORKS IF THE CURRENT FILE IS IN THE SAME DIRECTORY
    //       AS THE MAIN PLUGIN FILE!
    return dirname(__FILE__) . '/' . basename(dirname(__FILE__)) . '.php';
}

...snip...