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Work around 'Header already sent' problem?

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  #1  
Old October 22nd, 2003, 08:54 PM
Decoy Decoy is offline
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Work around 'Header already sent' problem?
On one site I am working on I set a cookie immediately upon visiting the site.

I am writing a fairly simple function that allows users to recommend the site to their friends. To help prevent spamming I wanted to set an additional cookie that would register the referral and not allow the same person to refer again for 24 hours.

PHP Code:
if($sent > '1')
  { 
    genMsg('refer_limit'); 
  }
  else
  {
    $num = $sent + 1; 
    setcookie("sent", "$num", time()+86400);

    mail sent...
  } 

Of course, I get the 'Headers already sent' error. Does anyone know a way around this, or if not, have a suggestion that will allow me to control the number of referrals a visitor can send?

Thanks
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  #2  
Old October 22nd, 2003, 09:27 PM
digitallysmooth digitallysmooth is offline
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Only allow up to maybe 50 referrals per IP address per day. Makes things a lot simpler.

On the referral submit form, only give the user two or three boxes to fill in so they can only submit to that may people at once.

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  #3  
Old October 22nd, 2003, 10:02 PM
Decoy Decoy is offline
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Hi laidbak,

Good idea...I use the following function.

PHP Code:
function GetIP()
{
  if(getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
    $ip = getenv("HTTP_CLIENT_IP");
  else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
    $ip = getenv("HTTP_X_FORWARDED_FOR");
  else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
    $ip = getenv("REMOTE_ADDR");
  else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
    $ip = $_SERVER['REMOTE_ADDR'];
  else
    $ip = "unknown";
  return($ip);
} 


thanks,
Rob
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  #4  
Old October 23rd, 2003, 12:19 AM
digitallysmooth digitallysmooth is offline
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Alright... good job. Glad I could help.
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  #5  
Old October 23rd, 2003, 11:49 AM
mjlivelyjr mjlivelyjr is offline
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If you use php's output buffering functions it should do the trick. At the begining of the code put this line:

Code:
//begin buffering
ob_start();


and at the end of the code put this function

Code:
//end buffering
ob_end_flush();


basically what this does is prevents any text from being sent to the browser until your entire page has processed. This also will prevent the headers from being sent until after the script has run.

By default PHP will automatically send headers as soon as your script attempts to send its first character to the browser. Hence the "headers already sent" error. Use the above code and your problem should be fixed.
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