始终使用上载目录存储文件，而不是其他文件。有两个原因：

插件更新时会替换插件目录，因此您的自定义文件将被删除

$uploads = wp_get_upload_dir();

if ( $uploads[\'error\'] ) {
    // something is very wrong, stop messing here
}
else {
    $my_dirname = \'your_plugin_name\';
    $full_path  = $uploads[\'basedir\') . "/$my_dirname";

    if ( ! is_dir( $full_path ) {
        if ( ! mkdir( $full_path ) ) {
            // handle the case when you can\'t create a directory
        }           
    }
}

请参见wp_get_upload_dir() documentation.