output from session_start

[Gurzi]

Hello, i have a weird doubt and i dont know the answer.

 

I was using the session_start in the first line of my code, and 5 lines after i had to use the header() function and of course it said that ouput already had been sent.

 

I understood and i tried something, like this

 

session_start()

session_destroy()

header()

 

and it worked, and i dont know why , doesn't it sent ouput to the browser ??

 

Weird :s

 

 

[DarkWater]

Show me what you had in those 5 lines. =P

[Gurzi]

I was trying to develop an captcha system so i had this

 

<?php

session_start();

if($_POST['captcha'] != $_SESSION['captcha']){

  header("Location: index.php");

}else{

// do something

}

?>

 

When the user entered the captcha wrong, it says that output already had been sent.

 

So i tried this way:

 

<?php

session_start();

$test = $_SESSION['captcha'];

session_destroy();

 

if($test != $_POST['captcha']){

header("Location: index.php");

}else{

// do something

}

 

?>

 

and it worked :S but i dont know the reason :x

[PFMaBiSmAd]

We need the error message as well.

[Gurzi]

We need the error message as well.

 

i don't have the error anymore, and i can't put online the old way, but it is just how i said, headers already sent

[DeanWhitehouse]

you would only get that error if there is any output before the header being sent, e.g. echo's

[Gurzi]

you would only get that error if there is any output before the header being sent, e.g. echo's

 

does the session_start deliver some output ?

 

 

[ionik]

session_start will not conflict with sending a header there must have been some other problem causing this, white space somewhere.

[Gurzi]

session_start() will register internal output handler for URL rewriting when trans-sid is enabled. If a user uses ob_gzhandler or like with ob_start(), the order of output handler is important for proper output. For example, user must register ob_gzhandler before session start.

 

 

Ok, i'm not sure if it said headers or just output already sent, but in the session_start function description, it says that i throws output