编辑：在朋友的帮助下，我想出了一个解决方案。对于所有感兴趣的人：使用自定义帖子类型，在我的例子中是comment\\u post。然后上传如下图像：

$new_post = array(
\'post_title\'    => $title,
\'post_content\'  => $comment,
    \'post_status\'   => \'pending\',// Choose: publish, preview, future, draft, etc.
    \'post_type\' => \'comments_post\'  // Use a custom post type
);
//save the new post and return its ID
$pid = wp_insert_post($new_post); 
//Upload the file(s)
require_once(ABSPATH . "wp-admin" . \'/includes/image.php\');
require_once(ABSPATH . "wp-admin" . \'/includes/file.php\');
require_once(ABSPATH . "wp-admin" . \'/includes/media.php\');

if ($_FILES) {
    foreach ($_FILES as $file => $array) {
    //Check if the $_FILES is set and if the size is > 0 (if =0 it\'s empty)
    if(isset($_FILES[$file]) && $_FILES[$file][\'size\']>0){
    if ($_FILES[$file][\'error\'] !== UPLOAD_ERR_OK) {
    echo \'<div class="allert alert-error"><p>Upload error : \' . $_FILES[$file][\'error\'] . \'</p></div>\';
    $upload = false;
}else{
$upload = true;
}
if($upload == true){
    $attach_id = media_handle_upload( $file, $pid );
}
}
 }   
                                }//End if \'$_FILES\'

                            }//End if errornumbers