How to check whether php is connected to the database

How to connect to the php database and how to determine whether the database connection is successful.

Create a new php file (recommended learning: PHP video tutorial)

## Set variables and use the mysql_connect() function to connect to the database. The parameters in brackets are the database address, user name and database password

The database is connected. Then the database has What if the link is not successful?

Judge by if

If the connection is successful, output: Database connection is successful

If the database is not connected to the output die() function, the database connection fails and mysql_error() is used to output the error

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