What resources or documentation can help beginners troubleshoot PHP and MySQL connection issues?

When troubleshooting PHP and MySQL connection issues, beginners can refer to online resources such as the official PHP and MySQL documentation, online forums like Stack Overflow, and tutorials on websites like W3Schools. These resources can provide guidance on common connection problems, troubleshooting steps, and best practices for establishing a successful connection between PHP and MySQL.

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
?>