前端上传到媒体库的回调函数

function cud_handle_file_upload_to_media() {
    check_ajax_referer('file_upload_nonce', 'nonce');

    if(!current_user_can('edit_posts')) {
        wp_send_json_error(array('message'  => 'You are not allowed to upload this file'));
    }

    check_file_type($_FILES['csv_data_file']);
    check_file_size($_FILES['csv_data_file']);

    if(!isset($_FILES['csv_data_file'])) {
        wp_send_json_error(array('message'  => 'No file was uploaded'));

    }

    $file = $_FILES['csv_data_file'];

    $upload_overrides = array('test_form'  => false);

    //wp handle upload  返回错误 如果没成功 ,成功就返回文件数组信息,key 打印出来
    $movefile = wp_handle_upload($file, $upload_overrides);

    if($movefile && !isset($movefile['error'])) {
        $file_url = $movefile['url'];
        $file_type = $movefile['type'];
        $file_name = basename($movefile['name']);

        //store file information in the database 
        $file_data = array(
            'post_title'  => $file_name,
            'post_content' => '',
            'post_status'  => 'inherit',
            'post_mime_type'  => $file_type


        );

        //这里把它传到attchment media 库里， 我们插件是要传到自己的table里 
        $attch_id = wp_insert_attachment($file_data, $movefile['file']);


        if(!is_wp_error($attch_id)) {

            require_once(ABSPATH . 'wp-admin/includes/image.php');

            $attachment_data = wp_generate_attachment_metadata($attch_id, $movefile['file']);

            wp_update_attachment_metadata($attch_id, $attachment_data);

            wp_send_json_success(array('message'  => 'File Uploade succesfully!','attachment_id' => $attch_id));

        } else {
            wp_send_json_error(array('message' => 'Error storing file information in the database'));
        }


    } else {
        wp_send_json_error(array('message'  => $movefile['error']));
    }


}