To avoid Cannot send session cookie - headers already sent
warning which is caused by calling the session_start()
function without checking if the session is already started or not.
You can find following warning in error log file :
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /xxx/xxx/abc.php:8) in /xxx/xxx/test.php on line 11
Recommended way for versions of PHP >= 5.4.0
Instant Images if ( session_status() == PHP_SESSION_NONE ) {
session_start();
}
Source: http://www.php.net/manual/en/function.session-status.php
For versions of PHP < 5.4.0
if ( session_id() == '' ) {
session_start();
}
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