Поместить массив в WHERE -clause в PHP без нажатия X раз Postgres

Как вы можете поместить массив в WHERE -clause ниже без создания 50 pg_execute команд в PHP / PostgreSQL?

  // to get the question_ids of the newest questions $result_q_id = pg_prepare($dbconn, "query6", "SELECT question_id FROM questions ORDER BY was_sent_at_time DESC LIMIT 50;" ); $result_question_id = pg_execute($dbconn, "query6", array()); // to get all question ids $question_ids = pg_fetch_all($result_question_id); // to get titles, question_id from the db by using the question ids $result = pg_prepare($dbconn, "query8", "SELECT title FROM questions WHERE question_id = $1 // Problem here! How to get many WHERE's? ORDER BY was_sent_at_time DESC LIMIT 50;" ); $result = pg_execute($dbconn, "query8", array($question_ids)); // Problem here, since it is an array 

Я получаю следующую ошибку для строки, где у меня есть текст Problem here первый раз.

 Warning: pg_execute() [function.pg-execute]: Query failed: ERROR: invalid input syntax for integer: "Array" in /var/www/codes/handlers/handle_questions_by_time.php on line 22 Call Stack