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<?php session_start(); $_SESSION['test'] = 123; $var = array('_SESSION[test]' => 999); extract($var); var_dump($_SESSION);
Output for 5.2.3 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { ["test"]=> int(123) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.2 - 5.2.2
Warning: session_start(): Cannot send session cookie - headers already sent in /in/cJS25 on line 3 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/cJS25:3) in /in/cJS25 on line 3 array(1) { ["test"]=> int(123) }
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/cJS25 on line 3 Warning: session_start() [http://www.php.net/function.session-start]: Cannot send session cache limiter - headers already sent (output started at /in/cJS25:3) in /in/cJS25 on line 3 array(1) { ["test"]=> int(123) }