3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php session_start(); if (session_id() == '') { session_start(); } header('Test: 1');
based on Zi0PD
Output for 5.2.3 - 7.1.7
Output for 4.3.2 - 5.2.2
Warning: session_start(): Cannot send session cookie - headers already sent in /in/CVuVh on line 2 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/CVuVh:2) in /in/CVuVh on line 2
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/CVuVh 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/CVuVh:2) in /in/CVuVh on line 2