Using PHP Sample code receiving error: Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by ??
Answered
I'm trying to setup a PHP test page that will just authenticate.
Code in HTML page is very simple.
<?php
// Include the config file and the Podio library
require_once 'config.php';
require_once 'PodioAPI.php';
// Setup the API client reference. Client ID and Client Secrets are defined
// as constants in config.php
Podio::setup(CLIENT_ID, CLIENT_SECRET);
?>
All the supporting libraries were just pulled and uploaded in the root folder.
I can't seem to resolve the error:
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/36/10438736/html/index.php:9) in /home/content/36/10438736/html/lib/PodioSession.php on line 7
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/content/36/10438736/html/index.php:9) in /home/content/36/10438736/html/lib/PodioSession.php on line 7
Any ideas?
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You are sending output to the browser before starting the session and that will not work. The PHP library automatically starts a simple session manager for you, so it's running session_start for you.
Solution: Get rid of any output before the call to Podio::set()
All the best,
Andreas -
I am hitting this same wall as well and am not clear on your answer; do you mean that the podio API must be called before PHP outputs anything to the browser, or before anything at all including HTML outside PHP tags? I don't see anything in the example code the OP provided besides two includes and the instantiation of the API, nothing is output to the browser before the API session call.
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Hi Sean,
This is how all sessions work and it's not an issue specific to podio-php. If you are using sessions (and by default podio-php is using sessions to store the auth tokens for you), you cannot have any output before the session is started. In the case of podio-php you cannot have any output (HTML, whitespace, anything) before you call Podio::setup()
Does that help? Googling the error message will give you lots of discussion about this topic since it's a common issue for people who are just starting out with PHP and sessions.
/Andreas
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Hi Andreas,
Thanks for the clarification, I was just confused I think by the brevity of the code the OP provided. I move my podio::setup call to the beginning of the page in question and that resolved my issue. One thing I came across in my reading about sessions that other developers may find helpful is that the call to the session function has to happen in the first set of <?PHP tags in the document; ending with a ?> and starting another <?PHP, even if nothing is explicitly output to the browser in the first set of tags, counts as "output" and will snarl the session call.
much obliged for the help!
Sean
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