3v4l.org

run code in 300+ PHP versions simultaneously
<?php function fooA(): true {} function fooB(): false {} function fooC(): null {} function fooD(): true|null {} function fooE(): false|null {} //function fooF(): false|true {} // Fatal error: Type contains both true and false, bool should be used instead function fooG(): ?true {} function fooH(): ?false {} //function fooI(): ?null {} // Fatal error: null cannot be marked as nullable
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