生成短域名使用的

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public function createRandCode($string) {
        $code = '';
        $hex_code = '1qaz2wsx3edc4rfv5t-gb6yhn7ujm8ik9ol0p_';
        $now = microtime(true) * 10000;
        $strlen = strlen($hex_code);

        $hash_code = hash('sha256', $string);

        // 这里会为编码定义一个随机的长度，长度取决于step
        $step = rand(8, 16);
        $count = ceil(strlen($hash_code) / $step);

        for($i = 0; $i < $count; $i++) {
            $start = $i * $step;
            $hex_num = substr($hash_code, $start, $step);
            $num = 0x3fffffff & (1 * '0x' . $hex_num);
            $n = $num % $strlen;
            $code .= $hex_code[$n];
        }

        return $code;
    }