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<?php class A { public $b; } class B { public $a; } $a = new A; $a->b = new B; $a->b->a = $a; var_dump(serialize($a));
Output for git.master, git.master_jit, rfc.property-hooks
string(44) "O:1:"A":1:{s:1:"b";O:1:"B":1:{s:1:"a";r:1;}}"

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