疑难解答“无法发送会话缓存限制器 - 标头已发送” [英] Troubleshooting "Cannot send session cache limiter - headers already sent"

问题描述

我在网站上实现了一个联系表单，它利用php和phpmailer类通过我的主机smtp服务器发送邮件。

当我提交我得到以下错误信息：

lockquote
警告：session_start（）[function.session-start]：无法发送会话缓存限制器 - 头文件已发送

以下是我正在使用的代码的完整页面...

 <？php 
 session_start（）; 
 
 $ name = trim（$ _ POST ['name']）; 
 $ email = $ _POST ['email']; 
 $ comments = $ _POST ['comments']; 
 $ captcha = $ _POST ['captcha']; 
 
 $ site_owners_email ='myemail.com'; 
 $ site_owners_name ='我的名字'; 
 
 if（strlen（$ name）< 2）{
 $ error ['name'] =请输入您的姓名; 
} 
 
 if（！preg_match（'/ ^ [a-z0-9& \'\.\-_\ + +] + @ [a-z0-9 \  - ] + \。（[a-z0-9\  - ] + \。）* + [az] {2} /是'，$ email））{
 $ error ['email '] =请输入一个有效的电子邮件地址; 
 
 
 if（strlen（$ comments）< 3）{
 $ error ['comments'] =请留下评论; 
} 
 
 if（int（$ captcha）！==（$ _SESSION ['randomnr2']））{
 $ error ['captcha'] =CAPTCHA错误。请再试一次; 
} 
 
 if（！$ error）{
 
 require_once（'phpMailer / class.phpmailer.php'）; 
 $ mail = new PHPMailer（）; 
 
 $ mail-> From = $ email; 
 $ mail-> FromName = $ name; 
 $ mail-> Subject =联系表单; 
 $ mail-> AddAddress（$ site_owners_email，$ site_owners_name）; 
 $ mail-> Body = $ comments; 
 
 //邮件服务器设置
 
 $ mail->邮件程序=smtp; 
 $ mail-> Host =myhost.com; 
 $ mail-> Port =25; 
 $ mail-> SMTPSecure =tls; 
 $ mail-> SMTPAuth = true; 
 $ mail->使用者名称=myname.com; 
 $ mail->密码=mypassword; 
 
 $ mail->发送（）; 
 
 echo< li class ='success'> Thank you。 $名称。 。我们已收到您的电子邮件，我们会尽快与您联系！< / li>; 
 
}＃如果没有错误，则结束
 else {
 
 $ response =（isset（$ error ['name']））？ <李> 中。 $ error ['name']。 < / li> \\\
：null; 
 $ response。=（isset（$ error ['email']））？ <李> 中。 $ error ['email']。 < / li> \\\
：null; 
 $ response。=（isset（$ error ['comments']））？ <李> 中。 $ error ['comments']。 < /锂> 中： 空值; 
 $ response。=（isset（$ error ['captcha']））？ <李> 中。 $ error ['captcha']。 < /锂> 中： 空值; 
 
 echo $ response; 
}＃如果在发送
？时出现错误，则结束> 
  

表单 正常工作，因此php在很大程度上都很好。我通过表单发送消息，然后在收件箱中收到它。 解决方案

如果您不想将session_start ）在脚本开始处，请考虑开启输出缓冲（ob_start（））。

I've implemented a contact form on a website and it's utilising php and the phpmailer class to send the mails via my hosts smtp servers.

When I submit the form I get the following error message:

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent

Here's the full page of code I'm using ...

<?php
session_start();

    $name = trim($_POST['name']);
    $email = $_POST['email'];
    $comments = $_POST['comments'];
    $captcha = $_POST['captcha'];

    $site_owners_email = 'myemail.com'; 
    $site_owners_name = 'my name'; 

    if (strlen($name) < 2) {
        $error['name'] = "Please enter your name";  
    }

    if (!preg_match('/^[a-z0-9&\'\.\-_\+]+@[a-z0-9\-]+\.([a-z0-9\-]+\.)*+[a-z]{2}/is', $email)) {
        $error['email'] = "Please enter a valid email address"; 
    }

    if (strlen($comments) < 3) {
        $error['comments'] = "Please leave a comment";
    }

    if (int($captcha) !== ($_SESSION['randomnr2'])) { 
        $error['captcha'] = "CAPTCHA error. Please try again";
    }

    if (!$error) {

        require_once('phpMailer/class.phpmailer.php');
        $mail = new PHPMailer();

        $mail->From = $email;
        $mail->FromName = $name;
        $mail->Subject = "Contact Form";
        $mail->AddAddress($site_owners_email, $site_owners_name);
        $mail->Body = $comments;

        // Mail Server Settings

        $mail->Mailer = "smtp";
        $mail->Host = "myhost.com";
        $mail->Port = "25"; 
        $mail->SMTPSecure = "tls"; 
        $mail->SMTPAuth = true; 
        $mail->Username = "myname.com"; 
        $mail->Password = "mypassword"; 

        $mail->Send();

        echo "<li class='success'> Thank you " . $name . ". We've received your email. We'll be in touch with you as soon as we possibly can! </li>";

    } # end if no error
    else {

        $response = (isset($error['name'])) ? "<li>" . $error['name'] . "</li> \n" : null;
        $response .= (isset($error['email'])) ? "<li>" . $error['email'] . "</li> \n" : null;
        $response .= (isset($error['comments'])) ? "<li>" . $error['comments'] . "</li>" : null;
        $response .= (isset($error['captcha'])) ? "<li>" . $error['captcha'] . "</li>" : null;

        echo $response;
    } # end if there was an error sending
?>

The form is working so the php is, for the most part fine. I send a message through the form and I receive it in my inbox.

解决方案

If you don't want to put session_start() at the beginning of the script, consider turning on output buffering (ob_start()) instead.

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