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<?php session_start(); $old_sessionid = session_id(); session_regenerate_id(); $new_sessionid = session_id(); var_dump($old_sessionid === $new_sessionid);
Output for 5.2.3 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.3 - 4.4.9, 5.2.0 - 5.2.2
Warning: session_start(): Cannot send session cookie - headers already sent in /in/4kXsa on line 2 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/4kXsa:2) in /in/4kXsa on line 2 Warning: session_regenerate_id(): Cannot regenerate session id - headers already sent in /in/4kXsa on line 6 bool(true)
Output for 4.3.2 - 4.4.2, 5.0.0 - 5.1.6
Warning: session_start(): Cannot send session cookie - headers already sent in /in/4kXsa on line 2 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/4kXsa:2) in /in/4kXsa on line 2 Warning: session_regenerate_id(): Cannot send session cookie - headers already sent by (output started at /in/4kXsa:2) in /in/4kXsa on line 6 bool(false)
Output for 4.3.0 - 4.3.1
Warning: session_start() [http://www.php.net/function.session-start]: Cannot send session cookie - headers already sent in /in/4kXsa on line 2 Warning: session_start() [http://www.php.net/function.session-start]: Cannot send session cache limiter - headers already sent (output started at /in/4kXsa:2) in /in/4kXsa on line 2 Fatal error: Call to undefined function: session_regenerate_id() in /in/4kXsa on line 6