PHPMailer

应该是最流行的 PHP 发邮件的开源库。很多知名 PHP 开源项目中都有它的身影，比如：WordPress、Yii 等，支持你对发邮件的所有开发需求。看看示例代码，就知道使用起来有多简单啦：

php SMTPDebug = SMTP::DEBUG_SERVER;                      //Enable verbose debug output$mail->isSMTP();                                            //Send using SMTP$mail->Host       = 'smtp.example.com';                     //Set the SMTP server to send through$mail->SMTPAuth   = true;                                   //Enable SMTP authentication$mail->Username   = 'user@example.com';                     //SMTP username$mail->Password   = 'secret';                               //SMTP password$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;         //Enable TLS encryption; `PHPMailer::ENCRYPTION_SMTPS` encouraged$mail->Port       = 587;                                    //TCP port to connect to, use 465 for `PHPMailer::ENCRYPTION_SMTPS` above//Recipients$mail->setFrom('from@example.com', 'Mailer');$mail->addAddress('joe@example.net', 'Joe User');     //Add a recipient$mail->addAddress('ellen@example.com');               //Name is optional$mail->addReplyTo('info@example.com', 'Information');$mail->addCC('cc@example.com');$mail->addBCC('bcc@example.com');//Attachments$mail->addAttachment('/var/tmp/file.tar.gz');         //Add attachments$mail->addAttachment('/tmp/image.jpg', 'new.jpg');    //Optional name//Content$mail->isHTML(true);                                  //Set email format to HTML$mail->Subject = 'Here is the subject';$mail->Body    = 'This is the HTML message body in bold!';$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';$mail->send();echo 'Message has been sent';} catch (Exception $e) {echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";}