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Index.php文件连接源码：

/* Connect to a MySQL server 连接数据库服务器 */

$link = mysqli_connect(

'localhost', /* The host to connect to 连接MySQL地址 */

'root', /* The user to connect as 连接MySQL用户名 */

'password')； /* The password to use 连接MySQL密码 */

if ($link) {

printf("Can't connect to MySQL Server. Errorcode: %s ", mysqli_connect_error());

exit;

}else

echo '数据库连接上了！';

/* Close the connection 关闭连接*/

mysqli_close($link);

?>

浏览器报错信息：

Warning: mysqli_connect(): Unexpected server respose while doing caching_sha2 auth: 109 in D:\PHP\Apache24\htdocs\index.php on line 7

Warning: mysqli_connect(): MySQL server has gone away in D:\PHP\Apache24\htdocs\index.php on line 7

Warning: mysqli_connect(): (HY000/2006): MySQL server has gone away in D:\PHP\Apache24\htdocs\index.php on line 7

Warning: mysqli_close() expects parameter 1 to be mysqli, boolean given in D:\PHP\Apache24\htdocs\index.php on line 17