是的使用此代码可以获取附件id

if(isset($_FILES[\'myimage\']) && ($_FILES[\'myimage\'][\'size\'] > 0)) {
// Get the type of the uploaded file. This is returned as "type/extension"
$arr_file_type = wp_check_filetype(basename($_FILES[\'myimage\'][\'name\']));
$uploaded_file_type = $arr_file_type[\'type\'];
// Set an array containing a list of acceptable formats
$allowed_file_types = array(\'image/jpg\', \'image/jpeg\', \'image/gif\', \'image/png\');
if (in_array($uploaded_file_type, $allowed_file_types)) {
    $upload_overrides = array(\'test_form\' => false);
     $uploaded_file = wp_handle_upload($_FILES[\'myimage\'], $upload_overrides);
    if (isset($uploaded_file[\'file\'])) {
        $file_name_and_location = $uploaded_file[\'file\'];
        $file_title_for_media_library = $imagetitle;
        $attachment = array(
            \'post_mime_type\' => $uploaded_file_type,
            \'post_title\' => \'Uploaded image \' . addslashes($file_title_for_media_library),
            \'post_content\' => \'\',
            \'post_status\' => \'inherit\'
        );
        // Run the wp_insert_attachment function. This adds the file to the media library and generates the thumbnails. If you wanted to attch this image to a post, you could pass the post id as a third param
        $attach_id = wp_insert_attachment($attachment, $file_name_and_location);//here you get attachment id
        require_once(ABSPATH . "wp-admin" . \'/includes/image.php\');
        $attach_data = wp_generate_attachment_metadata($attach_id, $file_name_and_location);
        wp_update_attachment_metadata($attach_id, $attach_data);
        update_post_meta($post_id, \'pluginimage\', $attach_id);//update post data by attachment id
        $upload_feedback = false;
    }
}}