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<?php $a = new class { public function foo(){ return 'foo';}}; var_dump($a?->foo()); var_dump(($b = null)?->foo()); var_dump($c?->foo());
Output for 8.1.9 - 8.1.28, 8.2.10 - 8.2.18, 8.3.0 - 8.3.6
string(3) "foo" NULL Warning: Undefined variable $c in /in/vMEvT on line 9 NULL

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