您忘记获取结果

$result = mysql_query($sql);
$row = mysql_fetch_assoc($result);
echo $row['name'];

请不要在新代码中使用 mysql_* 函数.它们不再维护并正式弃用.看到红框?了解准备好的语句，并使用PDO 或 MySQLi- 这篇文章 将帮助您决定哪个.如果您选择 PDO，这里有一个很好的教程.

Please, don't use mysql_* functions in new code. They are no longer maintained and are officially deprecated. See the red box? Learn about prepared statements instead, and use PDO or MySQLi - this article will help you decide which. If you choose PDO, here is a good tutorial.