这个PHP文件如何新建一个数据库啊


<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
    <title></title>
</head>
<body>
    <?php
        $file_path = "info.txt";
        if(file_exists($file_path)){
            $fp = fopen($file_path, "w");
            $str = $_POST["id"] . PHP_EOL . $_POST["name"] . PHP_EOL . $_POST["password"] .PHP_EOL . $_POST["phone"] .PHP_EOL . $_POST["IpAddress"];
            fwrite($fp, $str);
            
        }
        fclose($fp);
    ?>
    <?php
            $mydbhost = "localhost";
            $mydbuser = "root";
            $mydbpass = '123456';
            $ip = $_SERVER["REMOTE_ADDR"];
            $conn = mysqli_connect($mydbhost, $mydbuser, $mydbpass);
            if(! $conn){
                die("connect error: " . mysqli_error($conn));
            }
             else
            { 
                /*echo ('用户信息注册成功!')."<br/>"; */  /* Close the connection 关闭连接*/
                     $url='../login/login.html';
                    echo "<script>location.href='$url'</script>";
            }
            mysqli_select_db( $conn, 'qqpass');
            $sql="INSERT INTO information (id, name, password , phone, qauto, remember, lastlogin, readpolicy, IpAddress, showstatus, loginflag, showlogin,email)
            VALUES
            ('$_POST[id]','$_POST[name]','$_POST[password]','$_POST[phone]' ,'1','1','0','1','$ip','离线','2','0', '$_POST[id]@qq.com')";
            $retval = mysqli_query($conn, $sql);
            if(! $retval){
                die("create error" . mysqli_error($conn));
            }
            mysqli_close($conn);
        ?>
</body>
</html>


你这个代码是插入一条记录啊,不是创建,和执行sql语句一样、只不过插入语句改成建库语句、create database 数据库