PHP如何在同一台服务器上与MySQL通信

Question

Does anyone know how php requests data from mysql?

If I have mysql in the same machine as php, does it open a tcp connection to the localhost on port 3306 or does it have some other way of getting the data?

Is it the same in linux and windows?

Thanks

Answer 1

if available it uses a unix socket, otherwise localhost.

Note that even if you specify localhost in the connection string it will try to use the faster "unix socket" if available

Answer 2

通常PHP打开在/tmp/mysql.sock中找到的本地管道以连接到本地版本的服务器，除非您在连接字符串中使用IP地址。

Answer 3

PHP opens a connection to port 3306 is the server via TCP to allow data communication. Hence, you can specify which port to connect to in mysql(i)_connect etc, and why, you need to have firewall rules for mysql.

It is the same in Windows as Linux

So yes, TCP :)

EDIT: Revision, In linux, php looks to connect to mysql via /tmp/mysql.sock the tmp directory needs to have correct permissions.