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<?php session_start(); $_SESSION['test'] = '123'; var_dump($_SESSION); echo "<br />\n"; $test = $_SESSION['test']; var_dump($test); echo "<br />\n"; $_SESSION['test'] = '1234'; var_dump($test);
Output for 5.2.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["test"]=> string(3) "123" } <br /> string(3) "123" <br /> string(3) "123"
Output for 4.3.2 - 5.2.2
Warning: session_start(): Cannot send session cookie - headers already sent in /in/XolbJ on line 2 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/XolbJ:2) in /in/XolbJ on line 2 array(1) { ["test"]=> string(3) "123" } <br /> string(3) "123" <br /> string(3) "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/XolbJ 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/XolbJ:2) in /in/XolbJ on line 2 array(1) { ["test"]=> string(3) "123" } <br /> string(3) "123" <br /> string(3) "123"