如何在函数内部建立mysql连接

Question

How can I make a mysql connection inside a function if my mysql connect is in another include file?

Here is the mysql connect include file.

DEFINE ('DB_USER', 'username');
DEFINE ('DB_PASSWORD', 'password');
DEFINE ('DB_HOST', 'localhost');
DEFINE ('DB_NAME', 'adfg');

$dbc = mysqli_connect (DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

if (!$dbc) {
    trigger_error ('Could not connect to MySQL: ' . mysqli_connect_error() );
}

Answer 1

File: DB.php

DEFINE ('DB_USER', 'username');
DEFINE ('DB_PASSWORD', 'password');
DEFINE ('DB_HOST', 'localhost');
DEFINE ('DB_NAME', 'adfg');

function getConnection() {
  $dbc = mysqli_connect (DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

  if (!$dbc) {
    trigger_error ('Could not connect to MySQL: ' . mysqli_connect_error() );
  } else {
    return $dbc;
  }
}

Other file:

require_once '/path/to/DB.php';

$connection = getConnection();
var_dump($connection->host_info);