一文解决PHP中生成随机数遇到的重复问题

    public static function uniqidNumberCode($length = 10)
    {
        $time = time() . '';
        if ($length < 10) $length = 10;
        $string = ($time[0] + $time[1]) . substr($time, 2) . rand(0, 9);
        while (strlen($string) < $length) $string .= rand(0, 9);
        return $string;
    }

function generateUniqueNumber($length = 10) {
    // 生成一个唯一标识符
    $uniqueId = uniqid();

    // 移除标识符中的前缀并截取前10位
    $uniqueNumber = substr($uniqueId, strlen($uniqueId) - 10);

    return $uniqueNumber;
}

function generateUniqueNumber($length = 10) {
    // 获取当前时间戳
    $timestamp = time();

    // 生成一个随机数，确保足够的随机性
    $randomNumber = mt_rand(100, 999);

    // 组合时间戳和随机数，并截取前10位
    $uniqueNumber = substr($timestamp . $randomNumber, 0, 10);

    return $uniqueNumber;
}

function generateUniqueNumber($length = 10) {
    $uniqueNumber = mt_rand(1000,9999);

    return $uniqueNumber;
}

//生成10位随机数
function generateUniqueNumber() {
    list($usec, $sec) = explode(' ', microtime());
    $seed = (float) $sec + ((float) $usec * 100000);
    mt_srand($seed);
    return mt_rand(1000000000,9999999999);
}