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What are common reasons for the MySQL error #2003 when using PHP and XAMPP?

The MySQL error #2003 in PHP and XAMPP commonly occurs when the MySQL server is not running or there is an issue with the connection settings. To solve this error, you can start the MySQL server in XAMPP control panel or check the connection settings in your PHP code to ensure they are correct.

php 
// MySQL server connection
$servername = "localhost";
$username = "root";
$password = "";
$database = "database_name";

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

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

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