3v4l.org

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<?php function foo(\DateTimeInterface $bar = new \DateTime()) {} foo(null);
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.15, 8.3.0 - 8.3.2
Fatal error: Uncaught TypeError: foo(): Argument #1 ($bar) must be of type DateTimeInterface, null given, called in /in/p2vdM on line 5 and defined in /in/p2vdM:3 Stack trace: #0 /in/p2vdM(5): foo(NULL) #1 {main} thrown in /in/p2vdM on line 3
Process exited with code 255.

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