3v4l.org

run code in 300+ PHP versions simultaneously
<?php final readonly class User { public string $name; } $user = new User(); $user->name = 'Jack';
Output for 8.4.1 - 8.4.14, 8.5.0
Fatal error: Uncaught Error: Cannot modify protected(set) readonly property User::$name from global scope in /in/4Xf2R:9 Stack trace: #0 {main} thrown in /in/4Xf2R on line 9
Process exited with code 255.
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.28
Fatal error: Uncaught Error: Cannot initialize readonly property User::$name from global scope in /in/4Xf2R:9 Stack trace: #0 {main} thrown in /in/4Xf2R on line 9
Process exited with code 255.
Output for 8.1.0 - 8.1.33
Parse error: syntax error, unexpected token "readonly", expecting "abstract" or "final" or "class" in /in/4Xf2R on line 3
Process exited with code 255.

preferences:
74.03 ms | 410 KiB | 5 Q