为什么在连接到远程托管的mysql数据库时，php PDO使用的主机名不同于mysql_connect（）所使用的主机名？

Question

I've mysql database and php/apache on two different servers: let's say hostphp.domain.com and hostmysql.domain.com.

On the mysql server I've set a user "my_user" with permissions to connect to "my_database" db from the specific host "hostphp.domain.com".

When I connect to it using mysql_connect it does right. But when I do it via php PDO I get this error:

SQLSTATE[42000] [1044] Access denied for user 'my_user'@'%' to database 'my_database'

I've done some tests and I found the problem is ...@'%', mysql is refusing that connection because "my_user" does not have permission to connect from any host.

Also I've tried to connect using mysql_connect with a wrong password to see the error and I get this:

Could not connect: Access denied for user 'my_user'@'hostphp.domain.com' (using password: YES).

The difference is in ..@'%' and ...@'hostphp.domain.com'.

So that's my question, why php pdo do not declare hostname when connecting to a remote host? (or is doing that wrong).

Thanks and sorry for my english.

Edit. Some code example, this does not work:

try {
    $pdo = new PDO(
        'mysql:host=hostmysql.domain.com;port=3306;dbname=my_database',
        'my_user',
        'my_pass'
    );
} catch (PDOException $e) {
    die($e->getMessage());
}

but this works ok:

$conn = mysql_connect('hostmysql.domain.com', 'my_user', 'my_pass');
if (!$conn) {
    die('Could not connect: ' . mysql_error());
} 

Answer 1

You have successfully connected to the host using mysql_connect, but you got no errors because you did not attempt to select the database.

Your user probably doesn't have access to your database.

Try running mysql_select_db("my_database"); after connected to the host and you should get the same error.