Cannot modify header information - headers already sent by The Mentioned Line Starts With Html

Question

Warning: Cannot modify header information - headers already sent by (output started at C:\wamp64\www\proj\index.php:2) in C:\wamp64\www\proj\menu\edit.php on line 8

index.php

<?php include_once "includes/functions.php";?>
<!DOCTYPE html>
<html>
<head>

edit.php

$id = $_GET['id'];
$menu = getmenu($id);
if (isset($_POST['btn']))
{
 $data = $_POST['frm'];
 edit_menu($data,$id);
 header("location:index.php?m=menu&p=list");
}

Can Anybody Help Me With This? BTW the database is updating and there is no problem with that.

where is called edit.php ? It should be included before ` `. — Syscall, Feb 10 '21 at 14:57
Does this answer your question? [How to fix "Headers already sent" error in PHP](https://stackoverflow.com/questions/8028957/how-to-fix-headers-already-sent-error-in-php) — Syscall, Feb 10 '21 at 14:59
I have a list.php that is showing my menus and each menu has a edit and delete button ```php

``` — Arshiya Gheibi, Feb 10 '21 at 15:00
["Can Someone Help Me" is not an actual question](https://meta.stackoverflow.com/questions/284236/why-is-can-someone-help-me-not-an-actual-question) — Rob, Feb 11 '21 at 12:07

score 0 · Answer 1 · answered Feb 10 '21 at 15:45

I Found This Function Online, It Helped Me!

function safe_redirect($url, $exit=true) {
 
    // Only use the header redirection if headers are not already sent
    if (!headers_sent()){
 
        header('HTTP/1.1 301 Moved Permanently');
        header('Location: ' . $url);
 
        // Optional workaround for an IE bug (thanks Olav)
        header("Connection: close");
    }
 
    // HTML/JS Fallback:
    // If the header redirection did not work, try to use various methods other methods
 
    print '<html>';
    print '<head><title>Redirecting you...</title>';
    print '<meta http-equiv="Refresh" content="0;url='.$url.'" />';
    print '</head>';
    print '<body onload="location.replace(\''.$url.'\')">';
 
    // If the javascript and meta redirect did not work, 
    // the user can still click this link
    print 'You should be redirected to this URL:<br />';
    print "<a href="$url">$url</a><br /><br />";
 
    print 'If you are not, please click on the link above.<br />';    
 
    print '</body>';
    print '</html>';
 
    // Stop the script here (optional)
    if ($exit) exit;
}

src : https://www.jonasjohn.de/snippets/php/secure-redirect.htm#:~:text=This%20little%20function%20ensures%20that,link%20to%20the%20new%20URL.

Cannot modify header information - headers already sent by The Mentioned Line Starts With Html

1 Answers1