发给多人邮件的类

//class.emailer.php
class Emailer
{
private $sender;
private $recipients;
private $subject;
private $body;
function __construct($sender)
{
$this->sender = $sender;
$this->recipients = array();
}
public function addRecipients($recipient)
{ 
array_push($this->recipients, $recipient);
}
public function setSubject($subject)
{
$this->subject = $subject;
}
public function setBody($body)
{
$this->body = $body;
}
public function sendEmail()
{
foreach ($this->recipients as $recipient)
{
$result = mail($recipient, $this->subject, $this->body,
"From: {$this->sender}\r\n");
if ($result) echo "Mail successfully sent to {$recipient}<br/>";
}
}
}