3v4l.org

run code in 300+ PHP versions simultaneously
<?php $row = array(m); echo " <h2>question</h2> <p>".chr(64 + $row[0])."</p> <h2>answer</h2> <p>".chr(64 + $row[1])."</p>";
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "m" in /in/YUhud:2 Stack trace: #0 {main} thrown in /in/YUhud on line 2
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Warning: Use of undefined constant m - assumed 'm' (this will throw an Error in a future version of PHP) in /in/YUhud on line 2 Warning: A non-numeric value encountered in /in/YUhud on line 6 Notice: Undefined offset: 1 in /in/YUhud on line 8 <h2>question</h2> <p>@</p> <h2>answer</h2> <p>@</p>
Output for 7.3.32 - 7.3.33
Warning: Use of undefined constant m - assumed 'm' (this will throw an Error in a future version of PHP) in /in/YUhud on line 2 Warning: A non-numeric value encountered in /in/YUhud on line 6 <h2>question</h2> <p>@</p> <h2>answer</h2> <p>@</p>
Output for 7.1.0 - 7.1.33
Notice: Use of undefined constant m - assumed 'm' in /in/YUhud on line 2 Warning: A non-numeric value encountered in /in/YUhud on line 6 Notice: Undefined offset: 1 in /in/YUhud on line 8 <h2>question</h2> <p>@</p> <h2>answer</h2> <p>@</p>
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
Notice: Use of undefined constant m - assumed 'm' in /in/YUhud on line 2 Notice: Undefined offset: 1 in /in/YUhud on line 8 <h2>question</h2> <p>@</p> <h2>answer</h2> <p>@</p>

preferences:
185.97 ms | 402 KiB | 229 Q