PHP utility function collection

<?php

if (!function_exists('number_random')) {
    /**
     * 生成随机数字串
     *
     * @param int $length
     * @return string
     */
    function number_random($length = 6)
    {
        $result = '';
        for ($i = 0; $i < $length; $i++) {
            $result .= mt_rand(0, 9);
        }

        return $result;
    }
}

if (!function_exists('string_random')) {
    /**
     * 生成随机字符串
     *
     * @param int $length
     * @return string
     */
    function string_random($length = 6)
    {
        $result = '';
        for ($i = 0; $i < $length; $i++) {
            $rand = mt_rand(1, 3);
            switch ($rand) {
                case 1:
                    $result .= mt_rand(0, 9);
                    break;
                case 2:
                    $result .= chr(mt_rand(65, 90));
                    break;
                default:
                    $result .= chr(mt_rand(97, 122));
                    break;
            }
        }

        return $result;
    }
}

if (!function_exists('get_order_number')) {
    /**
     * 生成订单号
     *
     * @param int $length
     * @return string
     */
    function get_order_number($length = 32)
    {
        $date = date('YmdHis');
        $micro = explode('.', microtime(true))[1];
        $rand = string_random($length - (strlen($date) + strlen($micro)));

        return $date . $micro . $rand;
    }
}

if (!function_exists('check_bank_card')) {
    /**
     * 验证银行卡号
     *
     * @param string $card
     * @return bool
     */
    function check_bank_card(string $card)
    {
        $arr_no = str_split($card);
        $last_n = $arr_no[count($arr_no) - 1];
        krsort($arr_no);
        $i = 1;
        $total = 0;
        foreach ($arr_no as $n) {
            if ($i % 2 == 0) {
                $ix = $n * 2;
                if ($ix >= 10) {
                    $nx = 1 + ($ix % 10);
                    $total += $nx;
                } else {
                    $total += $ix;
                }
            } else {
                $total += $n;
            }
            $i++;
        }
        $total -= $last_n;
        $total *= 9;

        return $last_n == ($total % 10);
    }
}

if (!function_exists('blocking_lock')) {
    /**
     * 阻塞锁
     *
     * @param string $lock_name 锁名字
     * @param int $valid 有效秒数
     * @return mixed
     */
    function blocking_lock(string $lock_name, $valid = 3600)
    {
        $lock_key = 'blocking_lock';
        while ($exp = Redis::hget($lock_key, $lock_name)) {
            if ($exp < microtime(true)) {
                Redis::hdel($lock_key, $lock_name);
            }
            usleep(10);
        }

        return Redis::hset($lock_key, $lock_name, microtime(true) + $valid);
    }
}

if (!function_exists('blocking_unlock')) {
    /**
     * 释放阻塞锁
     *
     * @param string $lock_name
     * @return mixed
     */
    function blocking_unlock(string $lock_name)
    {
        $lock_key = 'blocking_lock';

        return Redis::hdel($lock_key, $lock_name);
    }
}

if (!function_exists('random_color')) {
    /**
     * 随机十六进制颜色
     *
     * @return string
     */
    function random_color()
    {
        $str = '#';
        for ($i = 0; $i < 6; $i++) {
            $randNum = rand(0, 15);
            switch ($randNum) {
                case 10:
                    $randNum = 'a';
                    break;
                case 11:
                    $randNum = 'b';
                    break;
                case 12:
                    $randNum = 'c';
                    break;
                case 13:
                    $randNum = 'd';
                    break;
                case 14:
                    $randNum = 'e';
                    break;
                case 15:
                    $randNum = 'f';
                    break;
            }
            $str .= $randNum;
        }

        return $str;
    }
}

if (!function_exists('get_hour_history')) {
    /**
     * 获取当日历史小时
     *
     * @return array
     */
    function get_hour_history()
    {
        $history = [];
        for ($i = 0; $i <= date('H'); $i++) {
            $history[] = $i;
        }

        return $history;
    }
}