What are the potential pitfalls of using the msql functions in PHP instead of the mysql functions?

Using the msql functions in PHP instead of the mysql functions can lead to compatibility issues and deprecated warnings since the msql functions are outdated and not recommended for use. To solve this, it is recommended to switch to using the mysqli functions or PDO for interacting with MySQL databases in PHP.

// Connect to MySQL using mysqli
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}