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run code in 300+ PHP versions simultaneously
<?php interface Foo { public function f(): void; } class Bar implements Foo { public function f() {} }
Output for 8.5.0 - 8.5.3
Fatal error: Declaration of Bar::f() must be compatible with Foo::f(): void in /in/dRU5Q on line 8 Stack trace: #0 {main}
Process exited with code 255.
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18
Fatal error: Declaration of Bar::f() must be compatible with Foo::f(): void in /in/dRU5Q on line 8
Process exited with code 255.
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