How can the structure of a PHP class impact the overall functionality of a script, and what considerations should be made when designing classes for database access?

The structure of a PHP class can greatly impact the overall functionality of a script by organizing code in a logical and efficient manner. When designing classes for database access, considerations should be made for proper encapsulation, error handling, and security measures to prevent SQL injection attacks. 

class DatabaseConnection {
    private $host = 'localhost';
    private $username = 'root';
    private $password = '';
    private $database = 'my_database';

    public function connect() {
        $connection = new mysqli($this->host, $this->username, $this->password, $this->database);

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

        return $connection;
    }

    public function query($sql) {
        $connection = $this->connect();
        $result = $connection->query($sql);

        if (!$result) {
            die("Query failed: " . $connection->error);
        }

        return $result;
    }

    public function escapeString($string) {
        $connection = $this->connect();
        return $connection->real_escape_string($string);
    }
}

$database = new DatabaseConnection();
$sql = "SELECT * FROM users WHERE username = '" . $database->escapeString($username) . "'";
$result = $database->query($sql);

Keywords

PHP class structure functionality database access design considerations

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