PHP Header error

[Joveice]

I have this error, and I have no clue what makes this happen. Yes I googled it but that dident help me find the issue since line 126 in header is 

';

Warning: Cannot modify header information - headers already sent by (output started at D:\xampp\htdocs\header.php:126) in D:\xampp\htdocs\pages\m\create.php on line 64

So what is this? If you need more of the code I'll post it.

[mariushm]

Usually this problem is caused by some warning or error message (if they're configured to output anywhere besides log files) sent to the browser before headers are sent.

Also, if you echo / print or just plain have some characters in the php script outside php tags , they may be sent by the php engine as characters to the browser before the php code has a chance to send the header data.

In the past, php caused problems because it considered the UTF-8 BOM (two invisible characters hidden at the beginning of text files) which are sometimes added by text editors and they're kind of redundant. Newer versions of php detect those two invisible characters and ignore them. 

 

So it says there in the warning.  At line 126 or thereabouts in header.php , something sent something to the output so on line 64 in create.php some code can't send or modify headers because output has already started.

You can prevent functions from printing errors or warnings  to screen by placing an @ in front of the function name (the errors or warnings would still be logged to files)

 

Another possible fix could be to call the function ob_clean()  right before sending the headers ... ob_clean should clear the output buffers so if the data wasn't actually sent already to the browser, whatever was supposed to go to the browser before sending headers will be erased. Documentation : http://us3.php.net/manual/en/function.ob-clean.php

 

[leonfagan71]

52 minutes ago, Joveice said:

I have this error, and I have no clue what makes this happen. Yes I googled it but that dident help me find the issue since line 126 in header is 

';

Warning: Cannot modify header information - headers already sent by (output started at D:\xampp\htdocs\header.php:126) in D:\xampp\htdocs\pages\m\create.php on line 64

So what is this? If you need more of the code I'll post it.

The Header should be sent before any content is displayed.

If you could post more of the code, we can take a better look.

[Joveice]

50 minutes ago, leonfagan71 said:

The Header should be sent before any content is displayed.

If you could post more of the code, we can take a better look.

<?php
      if (isset($_SESSION['uid'])) {
        echo '
        <div class="user-panel">
          <div class="pull-left image">
            <img src="/images/uploads/avatar/'.$_SESSION['picid'].'" class="img-circle" alt="User Image">
          </div>
          <div class="pull-left info">
            <p>'.$_SESSION['uid'].'</p>
            <a href="#"><i class="fa fa-gear text-success"></i> Account</a>
          </div>
        </div>';
      }
      ?>

Line 126 in header.php is the </div>'; part.

      if (getCountPlayersInTeam($conn, $username) < 5) {
        header("Location: /pages/m/create.php?error=lt");
        exit();
      } else {}

line 64 is the header line

[leonfagan71]

21 minutes ago, Joveice said:

<?php
      if (isset($_SESSION['uid'])) {
        echo '
        <div class="user-panel">
          <div class="pull-left image">
            <img src="/images/uploads/avatar/'.$_SESSION['picid'].'" class="img-circle" alt="User Image">
          </div>
          <div class="pull-left info">
            <p>'.$_SESSION['uid'].'</p>
            <a href="#"><i class="fa fa-gear text-success"></i> Account</a>
          </div>
        </div>';
      }
      ?>

Line 126 in header.php is the </div>'; part.

      if (getCountPlayersInTeam($conn, $username) < 5) {
        header("Location: /pages/m/create.php?error=lt");
        exit();
      } else {}

line 64 is the header line

Okay, the header("Location:...") cannot be sent after content has been sent.

You must ensure that you're not echoing or printing any content before sending that header otherwise it will fail.

[Joveice]

9 minutes ago, leonfagan71 said:

Okay, the header("Location:...") cannot be sent after content has been sent.

You must ensure that you're not echoing or printing any content before sending that header otherwise it will fail.

Yea then I'm even more confused, since there are no echo before that. the only echo that is before, is in it's own if statment and is at line 20, and this is the way I have done it last time and it has always worked.

[mariushm]

You're trying to redirect the user to an error page, after content was already sent to user, that's the problem.

Go backwards, since that line 64 is only executed when the result of getCountPlayersInTeam($conn, $username) is less than 5, investigate what happens in that function.

 

If you're doing this locally on your computer, enable the php error reporting in php.ini and specify a error.log file and after running the script that shows the error, look at the bottom of error.log and you should see whatever warnings and errors show up.

 

My guess is $conn is not a valid database connection (maybe you forget to create a database connection further up in that page), or maybe the sql query you use in that function is invalid or you get no results, which triggers a warning or error when you later user  mysql_fetch_rows or something like that, which fails if the actual result set is 0.

 

[leonfagan71]

30 minutes ago, Joveice said:

Yea then I'm even more confused, since there are no echo before that. the only echo that is before, is in it's own if statment and is at line 20, and this is the way I have done it last time and it has always worked.

pop your code file on pastebin and I'll take a look and see what's up. It's hard to debug with small sections.

Cheers,

Leon.

[Joveice]

21 hours ago, leonfagan71 said:

pop your code file on pastebin and I'll take a look and see what's up. It's hard to debug with small sections.

Cheers,

Leon.

Which code should I post? header, the file I'm accessing or the function?

[leonfagan71]

6 minutes ago, Joveice said:

Which code should I post? header, the file I'm accessing or the function?

"code file"
If you'd prefer, you can send me the code file via PM.