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<?php class A {}; $a = new A; $b = new A; $c = $a; //$b->t = 1; var_dump(spl_object_hash($a)); var_dump(spl_object_hash($b)); var_dump(spl_object_hash($c)); $aa = [$a, $b]; var_dump(in_array($c, $aa, true));

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