包括Zend Mail Framework

Question

我在应用程序的根目录中有Zend：

myapp/Zend

如何将其包含在我的应用程序中？我已经尝试过include_once，require_once和set_include_path，但似乎没有任何效果。我一直收到以下错误：

Fatal error: Class 'Zend\Mail\Message' not found in

我创建了一个名为'mail-test.php'的文件，这里是代码：

use Zend\Mail\Message;
use Zend\Mail\Transport\Smtp as SmtpTransport; 
use Zend\Mail\Transport\SmtpOptions;

$message = new Message();
$message->addTo('myfriend@example.com')
        ->addFrom('email@example.com')
        ->setSubject('Contact Form');
$message->setBody('This is my message, read it.');

$transport = new SmtpTransport();
$options   = new SmtpOptions(array(
    'name'              => 'my.secure.server',
    'host'              => '555.555.5.55',
    'port'              => 465, // Notice port change for TLS is 587
    'connection_class'  => 'plain',
    'connection_config' => array(
        'username' => 'username',
        'password' => 'password',
        'ssl'      => 'tls',
    ),
));
$transport->setOptions($options);
$transport->send($message);