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run code in 300+ PHP versions simultaneously
<?php interface I { function test(): int; } class A implements I { function test(): int {} } class B extends A { function test(): string {} } ?>
Output for 7.4.0 - 7.4.33, 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
Fatal error: Declaration of B::test(): string must be compatible with A::test(): int in /in/V71FR on line 16
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 B::test(): string must be compatible with A::test(): int in /in/V71FR on line 16
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Fatal error: Declaration of B::test(): string must be compatible with A::test(): int in /in/V71FR on line 14
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Fatal error: Declaration of B::test(): string must be compatible with I::test(): int in /in/V71FR on line 14
Process exited with code 255.

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