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<?php class x implements splobserver { public function update($subject) {} }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Return type of x::update($subject) should either be compatible with SplObserver::update(SplSubject $subject): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/sagGf on line 4
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25
Fatal error: Declaration of x::update($subject) must be compatible with SplObserver::update(SplSubject $SplSubject) in /in/sagGf on line 3
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Declaration of x::update() must be compatible with SplObserver::update(SplSubject $SplSubject) in /in/sagGf on line 3
Process exited with code 255.

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