3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php session_start(); echo strlen(session_id());
Output for 5.2.3 - 7.1.0
32
Output for 4.3.2 - 5.2.2
Warning: session_start(): Cannot send session cookie - headers already sent in /in/4qf7L on line 4 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/4qf7L:4) in /in/4qf7L on line 4 32
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/4qf7L on line 4 Warning: session_start() [http://www.php.net/function.session-start]: Cannot send session cache limiter - headers already sent (output started at /in/4qf7L:4) in /in/4qf7L on line 4 32