get_parent_theme_file_path

WordPress Version: 4.7

/**
 * Retrieves the path of a file in the parent theme.
 *
 * @since 4.7.0
 *
 * @param string $file Optional. File to return the path for in the template directory.
 * @return string The path of the file.
 */
function get_parent_theme_file_path($file = '')
{
    $file = ltrim($file, '/');
    if (empty($file)) {
        $path = get_template_directory();
    } else {
        $path = get_template_directory() . '/' . $file;
    }
    /**
     * Filters the path to a file in the parent theme.
     *
     * @since 4.7.0
     *
     * @param string $path The file path.
     * @param string $file The requested file to search for.
     */
    return apply_filters('parent_theme_file_path', $path, $file);
}