weilaibike-server/Applications/Handlers/ToolsHandler.php

<?php
/**
 * Created by PhpStorm.
 * User: Mead
 * Date: 2019/9/3
 * Time: 8:46 PM
 */

namespace App\Handlers;

trait ToolsHandler
{
    public static function stitching($arr, $offset, $length = false)
    {
        if ($length === false) return implode('', array_slice($arr, $offset));
        return implode('', array_slice($arr, $offset, $length));
    }
}