[SOLVED] header location

AdRock · #1 Oct 12th, 2007, 10:21

I know headers have got to be before any output to the browser but I have finally come up against a problem where i need to use header ( "Location:

This is a very cut down version of the layout for my site and you can see that I have a switch that gets the page from the url and includes that page for display

PHP: Select all


<?php 
   session_start(); 
?>
<!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" lang="en">
<head>
<title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></meta>
</head>
<body>
<div id="wrapper">
 <div id="content">
     <div id="header">
  <img src="images/title.jpg" alt="title" />
     </div>
     <div id="left">
  <div class="news">
      <div class="heading">
   <h3 class="head">Navigation</h3>
      </div>
      <-- Navigation goes here -->
  </div>
   
     </div>
     <div id="content2">
      <?php
   //Main page content changes here
       switch ($_GET['page'])
           {
       case "user_details":
       include('user_details.php');
       break;
             default:
       include('home.php');
           }
          ?>
     </div>
    </div>
</div>
<div id="footer"> 
</div>
</body>
</html>

The problem that I'm going to come up against in one of the pages that get included, there is a header ("Location: and I'm pretty sure that I'm going to get that headers already sent message.

Is there any way I can get around this?

c010depunkk · #2 Oct 12th, 2007, 10:27

Well, you could use a javascript redirect.....

Otherwise you are going to have to include your pages before you output anything.

Rakuli · #3 Oct 12th, 2007, 10:34

You could use output buffering. This will store all of the output until requesting it be sent to the page.

put ob_start(); at the top of your script and ob_end_flush(); when you know you won't have to change the headers after that point.

This will allow you to send headers after 'writing' to the output buffer.

Cheers

AdRock · #4 Oct 12th, 2007, 14:13

In your opinion, do you think I should try and rewrite my site so that and headers are at the top of th page before anything is being output or stick with what I have got and use ob_start() and ob_flush().

The second option seems a much quicker solution as well as saving a lot of time and hard work and also saves on duplicated code but it could be good practice to learn the other way.

Any opinions?

Rakuli · #5 Oct 12th, 2007, 14:17

There's no big issue with using output buffering and it gives you the ability to perform functions on ALL the data before outputing it.

The problem comes when you have a large page and you're storing it in a buffer. Imagine a large page being hit by 100 users at once -- could bring down a shared server for a time.

In most cases though there is more advantages than not.. I rarely use it as I usually send all headers before outputting anything.. It would be coding prefence really.

alexgeek · #6 Oct 12th, 2007, 15:38

Quote:

Originally Posted by Rakuli

You could use output buffering. This will store all of the output until requesting it be sent to the page.

put ob_start(); at the top of your script and ob_end_flush(); when you know you won't have to change the headers after that point.

This will allow you to send headers after 'writing' to the output buffer.

Cheers

Thanks again Rakuli for that, added to my collection of useful functions

AdRock · #7 Oct 12th, 2007, 16:51

Would this work?

At the top of the page put this

PHP: Select all


<?php
    if( $location !=null )
    {
         header( "Location:$location" );
    }
?>

and somewhere in the included file, if neccessary put this

PHP: Select all


$location = "whatever page you want to direct to";

alexgeek · #8 Oct 12th, 2007, 16:54

PHP checks in a logical order, top to bottom.
So I don't think that will work if $location is below the if statement.

AdRock · #9 Oct 12th, 2007, 19:13

What about this?

PHP: Select all


<?php
    $location = $_POST['location'];

    if( $location !=null )
    {
         header( "Location:$location" );
    }
?>

But how would i set the $_POST variable without using a form?

alexgeek · #10 Oct 12th, 2007, 21:04

That would work.
The form could be on another page, which links to this page or you could use GETs.

AdRock · #11 Oct 12th, 2007, 23:05

I have been ooing and ahhing about using the above solution and there are instances where i think it wouldn't work whcih is a pain. I want to try and make my code as efficient as poosible (possibly getting it drilled into us at college and uni).

Can someone please provide and example of a basic contact form or another page which uses a browser redirect so i can sede how it's done?

The ob_start() and ob_flush() works fine and that's fine for what i'm doing now but I want to try and get up to scratch with php and the proper procedures as I am thinking of doing my final year project at uni, a website that uses php and I'm going to need OOP and the correct way of doing things as I'm sure they're going to be reading the code

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[SOLVED] header location