function _wp_handle_upload( &$file, $overrides, $time, $action ) {

//…

//$new_file = $uploads['path'] . "/$filename";

// 修正为

$new_file = $uploads['path'] . "/" . iconv("UTF-8","GB2312",$filename);

//…

/*return apply_filters( 'wp_handle_upload', array(

        'file' => $new_file,

        'url'  => $url,

        'type' => $type

    ), 'wp_handle_sideload' === $action ? 'sideload' : 'upload' );*/

// 修正为

return apply_filters('wp_handle_upload', array(

         'file' => $uploads['path'] . "/$filename",

         'url' => $url,

         'type' => $type

         ) , 'wp_handle_sideload' === $action ? 'sideload' : 'upload' );