使用PHP连接MySQL数据库

Question

I am trying to create some very basic php code that will let me know If i have successfully connected to my MySQL database. Using MySQLi, I have found out that this is the best way of creating a connection:

$connection = mysqli_connect(host, username, password, dbname);

and then I saw that you can test to see if you are connected by using an if statement like this:

if(!$connection){
    echo "connection failed"
}
else{
    echo "Successful connection"
}

I believe what I am having the most difficult time trying to understand is the parameters for the mysqli_connect function. I understand that I need the username, password, and database name from MySQL, however I am fluttering at what needs to go where it says "host". Is anyone familiar with connecting to a MySQL database that could help me out?

Answer 1

The database doesn't have to run on the same computer as the PHP application, it can be on a network server. The host parameter is the name or IP address of the server.

If the database is running on the same machine, use "localhost" as the host argument.

Answer 2

A server is anything that handle its clients, Host is where a server is "hosted", for example if I have my birthday party tonight at my home then I would say, "I am hosting the party at this address ", Similarly in computer world, the "address" part is the IP of the server

"host" simply means IP of the mysql server.

MySQL server on the same computer is hosted on IP "127.0.0.1" also named as "localhost" ( by default ), Hopefully this answers your question.