主题内的插件-听起来像是新的东西。您可能在此上下文中找不到函数。让我们创建我们的：

<?php
/**
 * Get My Plugin URL.
 * @return string.
 */
function wpse295740_get_plugin_url() {
    // http://example.com/wp-content/themes/my-theme/inc/my-plugin
    return get_template_directory_uri() .\'/inc/my-plugin\';
}

/**
 * Get My Plugin Path.
 * @return string.
 */
function wpse295740_get_plugin_path() {
    // eg. /home/user/var/www/wordpress/wp-content/themes/my-theme/inc/my-plugin
    return get_template_directory() .\'/inc/my-plugin\';
}