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<?php class A {} $a = new A(); $b = new A(); $a->m = $b; var_dump(serialize($a));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Creation of dynamic property A::$m is deprecated in /in/WiC1S on line 8 string(32) "O:1:"A":1:{s:1:"m";O:1:"A":0:{}}"

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