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<?php class Person { function getN(){return 5;} function ret(){return $this;} function retN(){return null;} } class NullPerson extends Person { function getN(){return 0;} function ret(){return $this;} function retN(){return null;} } $a = new Person(); $b = null; var_dump(($a??new NullPerson())->getN(), ($b??new NullPerson())->getN());
Output for git.master, git.master_jit, rfc.property-hooks
int(5) int(0)

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