3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string1 = hello; strtoupper ( $string1 ); echo $string1; ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Undefined constant "hello" in /in/gjMl6:1 Stack trace: #0 {main} thrown in /in/gjMl6 on line 1
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant hello - assumed 'hello' (this will throw an Error in a future version of PHP) in /in/gjMl6 on line 1 hello
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, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Notice: Use of undefined constant hello - assumed 'hello' in /in/gjMl6 on line 1 hello

preferences:
216.64 ms | 404 KiB | 309 Q