(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.1.0) Returns the number of rows affected by the last SQL statement

(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.1.0) Executes a prepared statement

(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.2.0) Retrieve a database connection attribute

(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.1.0) Creates a PDO instance representing a connection to a database