(PHP 5 >= 5.1.0, PHP 7) Sends a request to execute a prepared statement with given parameters, without waiting

(PHP 5 >= 5.1.0, PHP 7) Submits a request to create a prepared statement with the given parameters, and

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Test if a field is SQL NULL

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Gets the backend's process ID

(PHP 5 >= 5.6.0, PHP 7) Poll the status of an in-progress asynchronous PostgreSQL connection attempt.

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Reset connection (reconnect)

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Returns the printed length

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Returns the name of a field

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Returns number of affected records (tuples)

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Unescape binary for bytea type