3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php session_start(); $loggedOutLink = '<a href="logout.php">Log out</a>'; $loggedInLink = '<a href="login.php">Log in</a>'; if ($_SESSION['isLoggedIn']===TRUE){ echo $loggedInLink; } else { echo $loggedOutLink; } ?>
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined index: isLoggedIn in /in/30826 on line 6 <a href="logout.php">Log out</a>
Output for 5.2.3 - 5.2.17
Notice: Undefined index: isLoggedIn in /in/30826 on line 6 <a href="logout.php">Log out</a>
Output for 4.3.2 - 5.2.2
Warning: session_start(): Cannot send session cookie - headers already sent in /in/30826 on line 2 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/30826:2) in /in/30826 on line 2 Notice: Undefined index: isLoggedIn in /in/30826 on line 6 <a href="logout.php">Log out</a>
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/30826 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/30826:2) in /in/30826 on line 2 Notice: Undefined index: isLoggedIn in /in/30826 on line 6 <a href="logout.php">Log out</a>