php – 为什么SwiftMailer会发送两封电子邮件？

$email = /*some email recipient*/;

$sendEmail = /*sender's email*/;
$sendName = /*sender's name*/;
$subject = /*email subject*/;
$body = /*email body*/;

//Create the message
//Create the Transport
$transport = Swift_SmtpTransport::newInstance('/*mail host*/',/*port*/)
->setUsername('/*some username*/')
->setPassword('/*some password*/')
;

//Create the Mailer using your created Transport
$mailer = Swift_Mailer::newInstance($transport);

//Create a message
$message = Swift_Message::newInstance($subject)
->setFrom(array($sendEmail => $sendName))
->setTo($email)
->setBody($body,'text/html')
;

//Send the message
$result = $mailer->send($message);

每次我运行此代码时,它都会将该发件人的电子邮件发送给该主题和正文的电子邮件.两个完全相同的电子邮件.知道为什么吗？

更新 – 这是完整的代码：

这是整个页面：

<?php

ob_start();
session_start();

require_once ('config.php');
require_once 'swiftmailer/lib/swift_required.php';
include ('functions.php');
require_once (MYSQL);

sendConfirmation(12,3,$dbc);

ob_end_flush();
?>

这是在页面中引用的函数(位于functions.php文件中：

function sendConfirmation($signup_id,$app_id,$dbc){

    //get signup email and ref code
    $q = "SELECT email,ref_code FROM sign_ups WHERE (signup_id='$signup_id')";
    $r = mysqli_query ($dbc,$q) or trigger_error("Query: $qn<br />MySQL Error: " . mysqli_error($dbc));

    $email;
    $ref;

    if (mysqli_num_rows($r) == 1){
        $row = mysqli_fetch_array($r,MYSQLI_ASSOC);
        $email = $row['email'];
        $ref = $row['ref_code'];
    }

    //get app info (subject,email body,sender email,sender name)
    $q = "SELECT bsignupemail_subj,bsignup_email,email,name,bsignup_url FROM apps WHERE (app_id='$app_id')";
    $r = mysqli_query ($dbc,$q) or trigger_error("Query: $qn<br />MySQL Error: " . mysqli_error($dbc));

    $sendEmail;
    $sendName;
    $subject;
    $body;
    $url;

    if (mysqli_num_rows($r) == 1){
        $row = mysqli_fetch_array($r,MYSQLI_ASSOC);
        $url = $row['bsignup_url'];
        $sendEmail = $row['email'];
        $sendName = $row['name'];
        $subject = $row['bsignupemail_subj'];
        $body = $row['bsignup_email'];
    }


    //Create the message
    //Create the Transport
    $transport = Swift_SmtpTransport::newInstance('/*host*/',/*port*/)
      ->setUsername('/*username*/')
      ->setPassword('/*password*/')
      ;

    //Create the Mailer using your created Transport
    $mailer = Swift_Mailer::newInstance($transport);

    //Create a message
    $message = Swift_Message::newInstance($subject)
      ->setFrom(array($sendEmail => $sendName))
      ->setTo(array($email))    
      ->setBody($body,'text/html')
      ;

    //Send the message
    $result = $mailer->send($message);
}