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<?php $a = 'BIT'; debug_zval_dump($a); $b = $a; debug_zval_dump($a);
Output for hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
string(3) "BIT" refcount(1) string(3) "BIT" refcount(1)
Output for 4.3.0 - 5.6.28
string(3) "BIT" refcount(2) string(3) "BIT" refcount(3)