PHP Database Connection and Functions

This is just a question on when database connections are opened based on file includes within PHP.  

So I have a config.php:

$host = 'localhost';
$dbUserName = 'dev';
$dbName = 'dev';
$dbPassword = 'devpw';

$db = new mysqli($host, $dbUserName, $dbPassword, $dbName);

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I also have functions.php:
function myAvatar($userID)
{
    include 'config.php';
    $sql    = "select avatar from users where id = " . $userID;
    $result = $db->query($sql);
    $row    = $result->fetch_assoc();

    return $row['avatar'];
}

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So my question is that if I include that functions page on a page but don't call a function from it, on page load does it still open a database connection because I'm including the config.php file?

example.php
<?php

include 'functions.php';

echo 'some text';

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LVL 12
Nathan RileyFounderAsked:
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Dan CraciunIT ConsultantCommented:
Yes.
0

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Willem van PeltCommented:
No, if the database connection is made inside a function, the connection is not made until you actually call that function.
You can try this easily by specifying an incorrect password: your script will then bork as soon as it tries to connect to the database.
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Dan CraciunIT ConsultantCommented:
@Willem: my bad, I did not read until the end.

This is what creates the database connection:
$db = new mysqli($host, $dbUserName, $dbPassword, $dbName);

Since you include functions.php, (not config.php, as I thought), that line is not actually executed until you call myAvatar.
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