php - Help with this error message > unexpected T_OBJECT_OPERATOR

The code below is part of an rss feed parser using WordPress's simplepie fetch_feed()...

Code is:

    if ($enclosure = $item->get_enclosure(0))
    {
    $image_thumb = $item->get_enclosure()->get_link().'screenshot.jpg';
    $image = $item->get_enclosure()->get_link().'screenshot-full.jpg';
    }
    $link = esc_url( strip_tags( $item->get_link() ) );

    $content = $item->get_content();

Upon trying to activate the theme in which this code appears, I'm getting the following error:

Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /home/.../functions.php on line 1341

Line 1341 is the line that starts with $image_thumb

Answer

My wild guess is that this is PHP 4, which doesn't support method chaining.