[PHP-NOTES] note 130413 added to class.weakmap

$data = new \WeakMap();
$a = new A();
$b = new B();
$data[$a] = 1;
$data[$b] = 2;
$data->count();//2

$data = new \WeakMap();
$a = new A();
$b = $a;
$data[$a] = 1;
$data[$b] = 2;
$data->count();//1
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