What is the difference between PDO and mysqli in PHP, and why is it important not to mix them?

The main difference between PDO and mysqli in PHP is that PDO is a database access layer providing a uniform method of access to multiple databases, while mysqli is specifically designed for MySQL databases. It is important not to mix them in the same project because using both can lead to inconsistencies in code structure and make maintenance more difficult. It is recommended to choose one and stick with it for consistency and ease of maintenance. 

// Example of using PDO for database connection and query
try {
    $pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');
    $stmt = $pdo->query('SELECT * FROM mytable');
    while ($row = $stmt->fetch()) {
        // process results
    }
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

Keywords

PDO mysqli difference importance mix

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