PHP 警告:无法修改标头信息 - 标头已由 发送(输出开始于 ...).在第 29 行


PHP Warning: Cannot modify header information - headers already sent by (output started at.......on line 29

每次我尝试时,我都会单击发送此错误。我在电子邮件中收到消息,但问题是它会将我带到错误页面,而不是将我带到我指定的页面。

这是我的代码:

<?php 
$errors = '';
$myemail = 'info@cherry-ao.com';//<-----Put Your email address here.
if(empty($_POST['name'])  ||  empty($_POST['email']) || empty($_POST['message']))
{
    $errors .= "'n Error: all fields are required";
}
$name = $_POST['name']; 
$email_address = $_POST['email']; 
$message = $_POST['message']; 
if (!preg_match("/^[_a-z0-9-]+('.[_a-z0-9-]+)*@[a-z0-9-]+('.[a-z0-9-]+)*('.[a-z]{2,3})$/i", $email_address))
{
    $errors .= "'n Error: Invalid email address";
}
if( empty($errors))
{
    $to = $myemail; 
    $email_subject = "Contact form submission: $name";
    $email_body = "You have received a new message. Here are the details:'n Name: $name 'n Email: $email_address 'n Message 'n $message"; 
    $headers = "From: $myemail'n"; 
    $headers .= "Reply-To: $email_address";
    mail($to,$email_subject,$email_body,$headers);
    //redirect to the 'thank you' page
    header('Location: thank_you.html');
} 
echo nl2br($errors);
?>

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如果您已将一些数据放入屏幕,则无法写入标头。

标头必须位于代码的顶部,然后再向用户输出任何内容