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<?php class A {} class B { private $foo = 'foo'; private $bar; public function __construct (A $x) { $this->bar = $x; } } $b1 = new B(new A); $b2 = clone $b1; var_dump($b1); var_dump($b2);
Output for git.master, git.master_jit, rfc.property-hooks
object(B)#1 (2) { ["foo":"B":private]=> string(3) "foo" ["bar":"B":private]=> object(A)#2 (0) { } } object(B)#3 (2) { ["foo":"B":private]=> string(3) "foo" ["bar":"B":private]=> object(A)#2 (0) { } }

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