lanzu_api_2021-12-26/app/Service/v3/Implementations/HelperService.php

<?php

namespace App\Service\v3\Implementations;

use App\Service\v3\Interfaces\HelperServiceInterface;

class HelperService implements HelperServiceInterface
{

    public function makeNumCode($length)
    {
        // 获取验证码
        $codeArr = array_map(function ($item) {
            return mt_rand(0,9);
        }, array_pad([], $length, 0));

        // 返回验证码
        return implode('', $codeArr);
    }

    /**
     * 请求参数判空
     * @param mixed $var 参数
     * @return bool
     */
    public function nonempty($var)
    {
        return ! (
            isset($var)
            && $var
            && !empty($var)
            && !is_null($var)
            && $var != 'undefined'
            && $var != 'unknown'
            && $var != 'null'
            && $var != 'false'
        );
    }

    public function filterEmoji($str)
    {
        $str = preg_replace_callback(
            '/./u',
            function (array $match) {
                return strlen($match[0]) >= 4 ? '' : $match[0];
            },
            $str);

        return $str;
    }
}