3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface ITest { public function apfel(): mixed; } class Test implements ITest { public function apfel(): array { return []; } } var_dump((new Test())->apfel());
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
array(0) { }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array(0) { }
Output for 7.4.0 - 7.4.33
Fatal error: Declaration of Test::apfel(): array must be compatible with ITest::apfel(): mixed in /in/PXDB6 on line 10
Process exited with code 255.
Output for 7.3.0 - 7.3.33
Fatal error: Declaration of Test::apfel(): array must be compatible with ITest::apfel(): mixed in /in/PXDB6 on line 8
Process exited with code 255.

preferences:
132.83 ms | 401 KiB | 156 Q