I am using CentOS if that helps.  I downloaded the binaries of 1.7.6.1.

I have a folder of 25 files.

One of these files contains a lot of HEREDOC.  It never parses the class (or any methods of the class) in this file.

A sample is below:
class UserModel {
 public function sendUpdatedEmailAddressEmail($activation_token)
        {

                $url = "http://{$_SERVER['SERVER_NAME']}/activate/" . $this->getUserId() . "?token=$activation_token";
                $copyrightyear = date('Y');

                $message_text = <<<MESSAGE
Dear Comic Enthusiast,

You have changed your email address at comiXology.com!

Please note - you must complete this last step to confirm your email address. You will only need to click on the link once, and your account will be activated.

To complete this last step, click on the link below:

$url

If you are having problems please contact a member of our support staff at info@comixology.com.

Regards,
The comiXology Development Team.

Express yourself, users can now write reviews of their favorite items.
http://www.comixology.com/reviews/

Got an iPhone? Now you can view your comiXology pull list anywhere and everywhere.
http://www.comixology.com/iphone/

&copy; $copyrightyear Iconology, Inc.
MESSAGE;
return $mail->Send();
}
}

I left out a lot of code for the sake of brevity.  But removing all of the HEREDOC causes it to work perfectly.