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Asked: 2026-06-01T18:13:43+00:00

I have a problem where I need to redirect to another page and pass

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I have a problem where I need to redirect to another page and pass a value, which is easy and I know how to do, except that theres the old header problem: Cannot modify header information – headers already sent by … line 17

<?php include('m_a2_functions.php'); ?>
<?php global_header(LOGIN); ?>
<?php login(); ?>
<?php 
if(isset($_POST['submit']))
{
    connect();
    $username = $_POST['username'];
    $password = $_POST['password'];

    $query = "SELECT password from users where username = '$username'";
    $result = mysql_query($query) or die ("There was an error executing the query $query:<br/>".mysql_error());
    $row = mysql_fetch_array($result);
    $encrypted_pass = $row[0];

    if (crypt($password, $encrypted_pass) == $encrypted_pass) {
        $flag = "y";
        header('Location: m_a2_view.php?flag=y');
    }

}
?>
<?php validation(); ?>
<?php page_footer(); ?>

This is all fine, except that there is a problem with the header part. It won’t redirect.

GLOBAL HEADER FUNCTION IN FUNCTIONS.PHP 

<?php function global_header($page_title){ ?>
<?php echo '<?xml version="1.0" encoding="UTF-8"?>'; ?> <- LINE 17
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
    <head>
        <title><?php echo "MARK - " . $page_title; ?></title>
        <link rel="stylesheet" href="style.css" />
    </head> 
    <body>
    <div id="container">
    <div id="logo"></div>
<?php } ?>

LINE 17

<?php echo '<?xml version="1.0" encoding="UTF-8"?>'; ?>

I know that’s what is causing it. It loads global_header at the start of my page and then can’t redirect to another page. Soon as I hit submit, my page should redirect, but it cannot!

Even if I start removing things, it won’t work. It will EVENTUALLY work after getting rid of global_header() completely, something which I can’t do.

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1 Answer

  1. Editorial Team

    The reason you are having this issue is because your script is multiple open <?php and closing ?> of PHP tag which has space and new line between them …

    Replace

    <?php include('m_a2_functions.php'); ?>
<?php global_header(LOGIN); ?>
<?php login(); ?>
<?php

    With 

    <?php 
include('m_a2_functions.php');
//global_header(LOGIN);
//login();

    Your Script

        include ('m_a2_functions.php');
    if (isset ( $_POST ['submit'] )) {
        connect ();
        $username = $_POST ['username'];
        $password = $_POST ['password'];

        $query = "SELECT password from users where username = '$username'";
        $result = mysql_query ( $query ) or die ( "There was an error executing the query $query:<br/>" . mysql_error () );
        $row = mysql_fetch_array ( $result );
        $encrypted_pass = $row [0];

        if (crypt ( $password, $encrypted_pass ) == $encrypted_pass) {
            $flag = "y";
            header ( 'Location: m_a2_view.php?flag=y' );
        }

    } else {
        echo global_header ( "LOGIN" );
        login ();
    }

    validation ();
    page_footer ();

    function global_header($page_title) {
        $content = '<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
    <head>
        <title><?php echo "MARK - ' . $page_title . '</title>
        <link rel="stylesheet" href="style.css" />
    </head> 
    <body>
    <div id="container">
    <div id="logo"></div>';

        return $content;
    }
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