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Cannot send session cookie - headers already sent

Thread began 11/25/2009 11:18 pm by lgw336173 | Last modified 1/03/2010 1:42 pm by Office Guy-172461 | 3462 views | 5 replies |


Cannot send session cookie - headers already sent

Registration page seems to be fine but I get this (below) when going to Login page. What on earth is this trying to tell me?
thank you.

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/a/n/d/andreamwagner/html/midcc/Arrow-Shell/WA_SecurityAssist/Helper_PHP.php:4) in /home/content/a/n/d/andreamwagner/html/midcc/Arrow-Shell/WA_SecurityAssist/Helper_PHP.php on line 6

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/content/a/n/d/andreamwagner/html/midcc/Arrow-Shell/WA_SecurityAssist/Helper_PHP.php:4) in /home/content/a/n/d/andreamwagner/html/midcc/Arrow-Shell/WA_SecurityAssist/Helper_PHP.php on line 6

Warning: Cannot modify header information - headers already sent by (output started at /home/content/a/n/d/andreamwagner/html/midcc/Arrow-Shell/WA_SecurityAssist/Helper_PHP.php:4) in /home/content/a/n/d/andreamwagner/html/midcc/Arrow-Shell/WA_SecurityAssist/Helper_PHP.php on line 46

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Hi there,

The "headers already sent" error typically means there is some white space between PHP tags before the HTML output is started. If you look above your head code, try to go through and ensure that when one PHP block ends, there is not an actual space after any closing tags.

One way to ensure there is no white space would be to bring the opening tag of a new php block right next to the closing tag of the last block, like this:


Technically, though, as long as it is a return after the closing block (making sure the space bar was not hit) and then the very next line starts your new block, you should be ok.

Best regards,


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Jason ByrnesWebAssist

It is also possible there is another PHP error occurring that is causing the error. It could be that your error reporting level is set to only show warnings.

Add the following code at line 1 of you page to set error reporting to show all errors:

Like Brian said, make sure there are no blank lines or spaces between any of the Closing PHP Blocks "?>" and starting PHP blocks "<?php"

In Dreamweaver, go to View -> Code View Options -> Invisible Elements to force dreamweaver to show spaces and returns, this can make it easier to see if spaces are at the end of any closing php lines.

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Office Guy-172461

New and improved (now with pictures!)

Solving the "headers already sent" problem

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1and1 php4 to php5 creates "headers already sent"

I recently uploaded PowerGallery to my 1and1 server to augment PowerStore and had to create the .htaccess file to have php parse via php5 and not php4.
I noticed that once i did that my insert page for PowerStore started returning the error. I moved the .htaccess file from the root to the PowerGallery folder and voila! solved.
only PowerGallery is being parsed via php5.

why would that cause the issue?


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Office Guy-172461

Did you follow the link above?
Without seeing the error, we can't tell which pages are causing the error.

Usually it is better to start a new thread than to attach to an old one. Makes it much easier to follow without confusing two different situations.

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