PHP标题（'位置：..'）不在服务器上工作[重复]

Question

This question already has an answer here:

• How to fix “Headers already sent” error in PHP 11 answers

I'm new to PHP. PHP header should redirect to specific page, but in my case PHP redirect is working on localhost fine but when I deploy the same code into server it is not working in the server. I also tried the below suggestions:

• Redirect function is not working on the live server. But working on localhost
• PHP header location-redirect doesn't work - why?

Which did't help in my case.

<?php

 include('../config/db.html'); 

if(!isset($_SESSION)){
    session_start();
}  
$msgsuccess = '';

if(!empty($_GET['msgsuccess'])){
    $msgsuccess = $_GET['msgsuccess'];
}
if(isset($_POST) && !empty($_POST)){
    if(!empty($_GET['url'])){ 
        $url = $_GET['url'];
    }

    if(!empty($_POST['password'])){
        $pass = md5($_POST['password']);
    }
    if(!empty($_POST['username'])){
        $email = trim($_POST['username']);
    }
    $query = "select * from users where email = '$email' and password = '$pass'";
    $exec_query = mysql_query($query);
    $row = mysql_fetch_array($exec_query);
    if(!empty($row)){
        $_SESSION['adminfirstname'] = $row['firstname'];
        $_SESSION['adminID'] = $row['id'];
        $_SESSION['logged_in_admin'] = true;
        $host  = $_SERVER['HTTP_HOST'];
        $uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
        $extra = 'index.htm';
        header("Location: http://$host$uri/$extra");
         die();
    }
    else{
        $msgsuccess = 'INVALID CREDENTIALS!! PLEASE ENTER VALID EMAIL OR PASSWORD';
    }
}


?>

Thanks in advance.

</div>

Answer 1

try to place the php code, at the beginning of the page, so that no output starts before,

    $host  = $_SERVER['HTTP_HOST'];
    $uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
    $extra = 'index.htm';
    $final_url = 'http://'.$host.$uri.'/'.$extra;
    header('Location:'.$final_url);

Replace code..