community-manage/app/Helper/helper.php

<?php
/**
 * 添加自定义辅助函数
 */

if ( ! function_exists('config_path'))
{
    /**
     * Get the configuration path.
     *
     * @param string $path
     * @return string
     */
    function config_path($path = '')
    {
        return app()->basePath() . '/config' . ($path ? '/' . $path : $path);
    }
}

if (! function_exists('public_path')) {
    /**
     * Get the path to the public folder.
     *
     * @param  string  $path
     * @return string
     */
    function public_path($path = '')
    {
        return app()->basePath() . '/public' . ($path ? '/' . $path : $path);
    }
}

function subtext($text, $length)
{
    if(mb_strlen($text, 'utf8') > $length) {
        return mb_substr($text, 0, $length, 'utf8').'...';
    } else {
        return $text;
    }
}