Type cast in PHP PDO (does not work like in Java?)

[Alexander Farber <alexander.farber@xxxxxxxxx>]

Good evening,

with PostgreSQL 9.6.3 and JDBC 42.1.1.jre7 types can be casted when calling a stored function:

        final String sql = "SELECT words_buy_vip(?::text, ?::int, ?::text, ?::text, ?::float, ?::inet)";

        try (Connection db = DriverManager.getConnection(DATABASE_URL, DATABASE_USER, DATABASE_PASS);
                PreparedStatement st = db.prepareStatement(sql)) {
             st.setString(2, sid);
             st.setInt(1, SOCIAL_FACEBOOK);
             // etc.
             st.executeQuery();
        }

But with PHP 5.4.16 on CentOS 7 Linux the types can not be casted (and strangely the statement is just not being executed without any error being reported) and the "::text", "::int" and "::inet" should be removed from the placeholders as in:

        $sql = 'SELECT words_buy_vip(?, ?, ?, ?, ?, ?)';   // can not use type casts here?

        try {
               $options = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, 

                                          PDO::ATTR_CASE => PDO::CASE_LOWER);
               $dbh = new PDO(sprintf('pgsql:host=%s;port=%u;dbname=%s', 

                        DBHOST, DBPORT, DBNAME), DBUSER, DBPASS, $options);
               $sth = $dbh->prepare($sql);
               $params = array($sid, SOCIAL_FACEBOOK, $payment_id, $product, $price, $_SERVER['REMOTE_ADDR']);
                $sth->execute($params);
        } catch (PDOException $ex) {
                error_log("PDO exception $ex");
        }

Is that so or do I overlook something?

And when reading the PHP docs
http://php.net/manual/en/pdostatement.bindvalue.php
and http://php.net/manual/en/pdo.constants.php
then there is no constant to use for the "::inet"

Thank you for any comments
Alex