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<?php declare(strict_types = 1); class HelloWorld { public function sayHello(?string $class): void { var_dump(new stdClass instanceof $class); } } (new HelloWorld)->sayHello(null);
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, 8.5.0 - 8.5.3
Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/MAigb:7 Stack trace: #0 /in/MAigb(11): HelloWorld->sayHello(NULL) #1 {main} thrown in /in/MAigb on line 7
Process exited with code 255.
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