Wordpress管理面板用户表单如何自定义图像上传域

function custom_user_profile_fields($user) {
    ?>
    <h3><?php _e('Custom Image Upload', 'text-domain'); ?></h3>
    <table class="form-table">
        <tr>
            <th><label for="custom_image"><?php _e('Custom Image', 'text-domain'); ?></label></th>
            <td>
                <input type="text" name="custom_image" id="custom_image" value="<?php echo esc_attr(get_the_author_meta('custom_image', $user->ID)); ?>" class="regular-text" />
                <input type="button" name="upload_image_button" id="upload_image_button" class="button-secondary" value="<?php _e('Upload Image', 'text-domain'); ?>" />
                <br />
                <span class="description"><?php _e('Upload a custom image for the user.', 'text-domain'); ?></span>
            </td>
        </tr>
    </table>
    <?php
}
add_action('show_user_profile', 'custom_user_profile_fields');
add_action('edit_user_profile', 'custom_user_profile_fields');

function save_custom_user_profile_fields($user_id) {
    if (!current_user_can('edit_user', $user_id)) {
        return false;
    }
    update_user_meta($user_id, 'custom_image', $_POST['custom_image']);
}
add_action('personal_options_update', 'save_custom_user_profile_fields');
add_action('edit_user_profile_update', 'save_custom_user_profile_fields');

#custom_image {
    width: 300px;
}