• Use the PHP code to connect to PostgreSQL and select a database.
  • Replace 'username' with your username, 'password' with your password, and 'dbname' with the database name: 
<?php
    $db_connection = pg_connect("host=localhost dbname=dbname user=username password=password");
?>

After connection is made to PostgreSQL and select the database. Now you can run SQL queries and other operations also.
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