[PHP知识库]PHP 通过UID计算邀请码

在有些项目中需要生成邀请码，我们可以设定规则来获取可以解码的邀请码。

/**
 *生成邀请码
*@param$userId
*@paramint$number
*@returnstring
 */
public static function createShareCode($userId, $number = 8)
{
    static $sourceString = [0, 1, 2, 3, 4, 5, 7, 8, 9];

    $num  = $userId;
    $code = '';
    while ($num) {
        $mod  = $num % 4;
        $num  = (int)($num / 4);
        $code = "{$sourceString[$mod]}{$code}";//邀请码拼接
    }
    //判断code的长度
    if (strlen($code) < $number) {
        $code = str_pad((string)$code, $number, '6',STR_PAD_RIGHT);
    }

    return $code;
}

/**
 *反算邀请码ID
 *@param$code
*@returnfloat|int
 */
public static function decode($code)
{
    $sourceString = '012345789';
    if (strrpos($code, '6') !== false) {
        $code = substr($code, 0, strpos($code, '6'));
    }
    $len  = strlen($code);
    $code = strrev($code);
    $num  = 0;
    for ($i = 0; $i < $len; $i++) {
        $num += strpos($sourceString, $code[$i]) * pow(4, $i);
    }
    return $num;
}

?如果长度不够使用6来填充和解码，数字和字符可以自定义。

测试代码:

邀请码生成和解码分享... - 代码在线运行https://www.toolnb.com/dev/runCode/07de6523010090046e85e8af917a5b81.html

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