Illustrating the Workings of mysqli prepare statements

When working with mysqli prepare statements in PHP the syntax can be a little confusing. Click on the underlined elements below. Hope this clarifies things.

Placeholder replaced by value $_GET['filmID']
$stmt = $mysqli->prepare("SELECT filmID, filmName FROM movies WHERE filmID = ? AND filmCert = ?");
$stmt->bind_param('is', $_GET['filmID'], $_GET['filmCert']);
Is an Integer
Is a String
Takes this value