3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface A { public function b() : mixed; } final class X implements A { public function b() : object { return new stdClass(); } } final class Y implements A { public function b() : void { } }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.4, 8.3.6 - 8.3.13
Fatal error: Declaration of Y::b(): void must be compatible with A::b(): mixed in /in/Gfd9i on line 18
Process exited with code 255.
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 Fatal error: Declaration of Y::b(): void must be compatible with A::b(): mixed in /in/Gfd9i on line 18
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Fatal error: Declaration of X::b(): object must be compatible with A::b(): mixed in /in/Gfd9i on line 10
Process exited with code 255.
Output for 7.3.0 - 7.3.33
Fatal error: Declaration of X::b(): object must be compatible with A::b(): mixed in /in/Gfd9i on line 8
Process exited with code 255.
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