PHP connection MySQL problem

Background of the problem:

My local machine do:
Intranet Server machine Multiple units: server_a Server_b
Personal Extranet machine: Net
Now the local server_a server_b net has MySQL and PHP

The problem is this.

PHP code is the simplest mysql_connect connection database, the same code

# -> ：标示请求数据， =》：标示结果local php    -> local mysql    =>oklocal php    -> server_a mysql =>errorlocal php    -> net mysql      =>okserver_a php -> server_a mysql =>okserver_b php -> server_a mysql =>ok

Why the local PHP connection server_a will be problematic.
数据库配置和php代码完全一样
Ask the big God for possible reasons

Reply content:

Background of the problem:

My local machine do:
Intranet Server machine Multiple units: server_a Server_b
Personal Extranet machine: Net
Now the local server_a server_b net has MySQL and PHP

The problem is this.

PHP code is the simplest mysql_connect connection database, the same code

# -> ：标示请求数据， =》：标示结果local php    -> local mysql    =>oklocal php    -> server_a mysql =>errorlocal php    -> net mysql      =>okserver_a php -> server_a mysql =>okserver_b php -> server_a mysql =>ok

Why the local PHP connection server_a will be problematic.
数据库配置和php代码完全一样
Ask the big God for possible reasons

Your local service is not in a network with the server, if it is not on the Internet, then we can not talk about access.
If you're on a network, or if you have an external port, check to see if MySQL in the server has permission to open external access.

Http://www.cnblogs.com/qq78292959/archive/2012/05/17/2505832.html

That's wrong.

Is it the same as a network segment? MySQL user is not%?

