Warning: mysqli_connect(): Server sent charset (255) unknown to the client. Please, report to the developers in G:\software\php\PHPTutorial\WWW\laoliu\php_mysql\day1.php on line 5 Warning: mysqli_connect(): (HY000/2054): Server sent charset unknown to the client. Please, report to the developers in G:\software\php\PHPTutorial\WWW\laoliu\php_mysql\day1.php on line 5 数据库连接失败Server sent charset unknown to the client. Please, report to the developers

回答: 这个错误是由于MySQL服务器发送了一个客户端未知的字符集引起的。根据引用\[1\]，这个错误可能是由于服务器请求了一个客户端未知的身份验证方法。根据引用\[2\]，在PHP代码中，你使用了mysql_connect函数来连接MySQL数据库，但是这个函数已经被弃用了。你应该使用mysqli_connect函数来连接数据库。另外，你还需要在连接之前设置字符集为utf8，可以使用mysqli_set_charset函数来实现。根据引用\[3\]，你可以尝试将以下代码添加到你的PHP代码中来解决这个问题：

$conn = mysqli_connect("localhost", "root", "******", "school");
if (!$conn) {
    die("数据库连接失败: " . mysqli_connect_error());
}

mysqli_set_charset($conn, "utf8");

echo "1";

mysqli_close($conn);

这样，你的PHP代码就可以成功连接到MySQL数据库了。如果还有其他问题，请在评论区提出，我会尽快回复。
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