What are the potential pitfalls of relying on older mysql functions in newer PHP database classes like PDO or mysqli?

Relying on older MySQL functions in newer PHP database classes like PDO or mysqli can lead to compatibility issues and deprecated warnings. To avoid this, it's recommended to use the newer functions provided by PDO or mysqli for improved security, performance, and maintainability of your code. 

// Example of using PDO to connect to a MySQL database
$dsn = 'mysql:host=localhost;dbname=mydatabase';
$username = 'username';
$password = 'password';

try {
    $pdo = new PDO($dsn, $username, $password);
    echo "Connected successfully";
} catch (PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}

Keywords

mysql functions PDO mysqli deprecated compatibility

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