这可能不是最优雅的方式（我不确定是否允许覆盖$\\u全局文件），但这似乎是可行的：

global $post;
if ($_FILES) {
    $files = $_FILES[\'upload_attachment\'];
    foreach ($files[\'name\'] as $key => $value) {
        if ($files[\'name\'][$key]) {
            $file = array(
            \'name\'     => $files[\'name\'][$key],
            \'type\'     => $files[\'type\'][$key],
            \'tmp_name\' => $files[\'tmp_name\'][$key],
            \'error\'    => $files[\'error\'][$key],
            \'size\'     => $files[\'size\'][$key]
            );

            $_FILES = array("upload_attachment" => $file);

            foreach ($_FILES as $file => $array) {
                $newupload = wp_insert_attachment($file,$post->ID);
            }                                   
        }
    }
}