代码如下：

$con = new mysqli($servername, $username, $password, $dbname);
if ($con->connect_error) {
die("数据库连接失败: " . $conn->connect_error);
}
echo "数据库连接成功！";
for($i = 0 ; $i < 20 ; $i++)
{
echo "进入循环！
";
$m = $i + 1 ;
$sql = "insert into stuAnswer values('$m','$uid','$tihao[$i]','$anser[$i]','$bzhun[$i]','$time_ks')";
$result = $con->query($sql);
if($result)
{
echo "插入成功！
";
}
}

执行结果：