php – 有没有办法在没有插件的情况下结账前上传图片？

我有这个插件,我已经为完成订单上传图像,但对于我的生活,我无法上传图像. $_FILES将永远不会返回,我不知道为什么.我希望在图片上传之前结账不会完成,这是否可能？
*我被告知woocommerce使用ajax购物车

<?php
    /*
        @package            UploadTest
        @wordpress_plugin
        Plugin Name:            UploadTest
        Plugin URI:             null
        Description:            
        Author:                 Goodship
        Version:                0.0.2
        Author URI:             www.Goodship.co.za
    */

    function add_image(){
        $testLog = fopen(plugin_dir_path( __FILE__ )."testicle.txt","w") or exit ("Unable to open file!");
        //if they DID upload a file...
        if($_FILES['testUpload']['name']){
            //if no errors...
            if(!$_FILES['testUpload']['error']){
                //now is the time to modify the future file name and validate the file
                $new_file_name = strtolower($_FILES['testUpload']['tmp_name']); //rename file
                if($_FILES['testUpload']['size'] > (1024000)) //can't be larger than 1 MB
                {
                    $valid_file = false;
                    $message = 'Oops!  Your file\'s size is to large.';
                }

                //if the file has passed the test
                if($valid_file){
                    //move it to where we want it to be
                    move_uploaded_file($_FILES['testUpload']['tmp_name'],plugin_dir_path( __FILE__ ).'uploads/'.$new_file_name);
                    $message = 'Congratulations!  Your file was accepted.';
                }
            }
            //if there is an error...
            else
            {
                //set that to be the returned message
                $message = 'Ooops!  Your upload triggered the following error:  '.$_FILES['testUpload']['error'];
            }
        }
        fwrite ($testLog,$message);
        fwrite ($testLog,var_dump($_FILES));
        fclose ($testLog);
    }

    add_action( 'woocommerce_checkout_update_order_meta','add_image');


    function add_checkout_notice() {
        echo    '<input type="file" name="testUpload" />';
    }
    add_action( 'woocommerce_checkout_before_customer_details','add_checkout_notice');

    ?>

您需要在您的子主题中调用以下函数.

function add_image($order_id){
  // Do your code of upload image.
} 
add_action( 'woocommerce_checkout_order_processed','add_image',1,1  );