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<?php class Foo { public function __isset($arg) { echo '__isset called', PHP_EOL; } } $foo = new Foo; echo 'Basic:', PHP_EOL; isset($foo->property); echo 'Deep:', PHP_EOL; isset($foo->property->child);
Output for git.master, git.master_jit, rfc.property-hooks
Basic: __isset called Deep: __isset called

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