3v4l.org

run code in 300+ PHP versions simultaneously
<?php $row = array(1, 2, 3, 4); echo " <h2>question</h2> <p>".('A' - 1 + $row[0])."</p> <h2>answer</h2> <p>".('A' - 1 + $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 - 8.3.7
Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /in/4f4Ra:6 Stack trace: #0 {main} thrown in /in/4f4Ra on line 6
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: A non-numeric value encountered in /in/4f4Ra on line 6 Warning: A non-numeric value encountered in /in/4f4Ra on line 8 <h2>question</h2> <p>0</p> <h2>answer</h2> <p>1</p>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20
<h2>question</h2> <p>0</p> <h2>answer</h2> <p>1</p>
preferences:
239.9 ms | 404 KiB | 357 Q