如何在woocommerce注册表中添加上传资料图片字段

<?php
/*
Plugin Name: Custom Registration Fields
Description: Add custom upload file field to WooCommerce registration form
*/

// 添加上传文件字段到注册表中的动作
function custom_woocommerce_register_form() {
    ?>
    <p class="woocommerce-form-row woocommerce-form-row--wide form-row form-row-wide">
        <label for="upload_file">上传资料图片</label>
        <input type="file" class="woocommerce-Input woocommerce-Input--text input-text" name="upload_file" id="upload_file" accept="image/*">
    </p>
    <?php
}
add_action( 'woocommerce_register_form', 'custom_woocommerce_register_form' );

// 保存上传文件字段数据到用户元数据中的动作
function custom_woocommerce_register_post( $username, $email, $validation_errors ) {
    if ( isset( $_FILES['upload_file'] ) && !empty( $_FILES['upload_file']['name'] ) ) {
        $upload = wp_upload_bits( $_FILES['upload_file']['name'], null, file_get_contents( $_FILES['upload_file']['tmp_name'] ) );
        if ( isset( $upload['error'] ) && $upload['error'] != 0 ) {
            wc_add_notice( '上传资料图片时出现错误，请重试。', 'error' );
        } else {
            // 保存上传文件的 URL 到用户的元数据中
            update_user_meta( $user_id, 'upload_file', $upload['url'] );
        }
    }
}
add_action( 'woocommerce_register_post', 'custom_woocommerce_register_post', 10, 3 );