you can get more information about this error on this link below:

session_start() Function Help

Thx a Lot!! This was my solution.
I put all session_start() at the begening, and thats it!
(sorry about my english, I'm spanish speaker)

Thx again...

.::kmfp::.

hello .::kmfp::. , glad i could help. Yo Hablo Espanol Amigo!

hey dude, thanks a lot.
i got the solution here too.

just in case someone gets this lil' problem too, the session_start() must be the first line, even before the doctype declare.

thx,but:
warning: session_start() [function.session-start]: cannot send session cookie - headers already sent by (output started at /var/www/a-header.php:10) in /var/www/header.php on line 1
can you help?

what this is telling you is that session_start() has already been executed in header.php on line one, now you are trying to send session_start() again on a-header.php.

very simple to fix your problem, remove session_start() from a-header.php on line 10.

i always declare session_start at the beggining of page index which include any other file but i have that error
warning: session_start() [function.session-start]: cannot send session cookie - headers already sent by (output started at e:xampplitehtdocscityindex.php:1) in e:xampplitehtdocscityindex.php on line 2
nothing previous to session_start except php tag

if you have any suggestion
thanks alot

make sure that your script starts like this:

Line 1: <?
Line 2: session_start();

becareful and look cosely, because you might have something like this:

line 1:
Line 2: <?
Line 3: session_start();

as you can see, line 1 is empty, so there might be a white space like a space character. you can't have anything before declaring session_start()

warning: cannot send session cache limiter - headers already sent (output started at c:apachehtdocsdhakanewsoraclememberindex.php:1) in c:apachehtdocsdhakanewsoraclememberindex.php on line 2

also remeber that if ur coding in utf-8 all document it's sending 'bom' - it is always 3 invisible characters before script starts
so change coding or use coding utf-8 without bom

notepad++ has it, u can get it at sf.net

guys, thanks a lot for explaining the issue with utf encoding with bom. i had same problem like the fellow below me but managed to solve it. all i needed to do was to change conding to utf8 without bom in notepad++

error: [2] session_start() [function.session-start]: cannot send session cookie - headers already sent by (output started at /home/allkindt/public_html/shared/config/tce_db_config.php:180) | line: 190 | file: /home/allkindt/public_html/shared/code/tce_functions_session.php
error: [2] session_start() [function.session-start]: cannot send session cache limiter - headers already sent (output started at /home/allkindt/public_html/shared/config/tce_db_config.php:180) | line: 190 | file: /home/allkindt/public_html/shared/code/tce_functions_session.php
error: [2] cannot modify header information - headers already sent by (output started at /home/allkindt/public_html/shared/config/tce_db_config.php:180) | line: 191 | file: /home/allkindt/public_html/shared/code/tce_functions_session.php

hi i face this problems..please give me a better solution....thanks..byeee

error: [2] unpack() [function.unpack]: type n: not enough input, need 4, have 0 | line: 3099 | file: /home/allkindt/public_html/shared/code/tcpdf.php
error: [2] cannot modify header information - headers already sent by (output started at /home/allkindt/public_html/shared/config/tce_db_config.php:180) | line: 2409 | file: /home/allkindt/public_html/shared/code/tcpdf.php
tcpdf error: some data has already been output to browser, can't send pdf file
i face this problems to create pdf file

error: [2] unpack() [function.unpack]: type n: not enough input, need 4, have 0 | line: 3099 | file: /home/allkindt/public_html/shared/code/tcpdf.php
tcpdf error: some data has already been output, can't send pdf file

thankyou, it helped.

thanks very much . i got the solution of my error. it's very useful to the new learners. thanks a lot.............

i was able to fix the error on the cookies when placing them on the first lines. however, i have a similar error with header("location:mypage.php"); the error displayed is

warning: cannot modify header information - headers already sent by (output started at /home/mydomain/public_html/mypage_add.php:4) in /home/mydomain/public_html/mypage_add.php on line 72.

the following are the codes:

71: if ($resultpage){
72: header("location:detail.php?name_id=$name_id#p$page_id");
73: exit();
74: }else{

what seems to be the problem?

still having it... though i tried every solution in this topic


warning: session_start() [function.session-start]: cannot send session cache limiter - headers already sent (output started at /home/admin/public_html/zaid/htpre/userclass.php:62) in /home/admin/public_html/zaid/htpre/sessiondata.php on line 28

this is the sessiondata.php and the error in

if ($sid == "") {
session_start();
$sid = session_id();
} else {
session_start($sid);
}

thanks a lot.. it really helped me..

who help me about this error
warning: session_start() [function.session-start]: open(/var/tmp/sess_519142a978e7bec6c052145fa892aca3, o_rdwr) failed: permission denied (13) in /mnt/web1/22/58/51474058/htdocs/kd/korenicajomla/joomla_1.0.13-stable-full_package/includes/joomla.php on line 800

warning: session_start() [function.session-start]: cannot send session cookie - headers already sent by (output started at /mnt/web1/22/58/51474058/htdocs/kd/korenicajomla/joomla_1.0.13-stable-full_package/includes/joomla.php:800) in /mnt/web1/22/58/51474058/htdocs/kd/korenicajomla/joomla_1.0.13-stable-full_package/includes/joomla.php on line 800

warning: session_start() [function.session-start]: cannot send session cache limiter - headers already sent (output started at /mnt/web1/22/58/51474058/htdocs/kd/korenicajomla/joomla_1.0.13-stable-full_package/includes/joomla.php:800) in /mnt/web1/22/58/51474058/htdocs/kd/korenicajomla/joomla_1.0.13-stable-full_package/includes/joomla.php on line 800
this error i have in administration panel

angie is the coolers

thanks you helped me a lot .i could rectify the errors.,and finally it working good.
i removed the extra "session start();" from the page and removed the extra header lines from the page expire .php,so it woring fine.

this doesn't help me one tiny bit... i'm getting the error being reported on line 1 - all that's on that line is a session starter...

if that's the case, then you need to check any of your includes, check for any blanks or white spaces on line one of any of the files, if you are getting this errors, its because you are sending some information to the browser before the sessionstart function. you just have to check and doublecheck, eventually, you will find it. it happened to me, i went crazy trying to find it, but eventually, i found it. just remember, you can't have anything before sessionstart

you can also get more help at:



http://www.php.net/manual/en/function.session-start.php





as you can see, even the official php site says you must call session_start() before anything you send to the browser, that includes white spaces. white spaces are hard to find, because you can't see them, you have to look for them

thanks...phew that worked for me...thanks again