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<?php $a = 'BIT'; debug_zval_dump($a); $b = $a; debug_zval_dump($a, $b);
Output for 7.0.0 - 7.1.0
string(3) "BIT" refcount(1) string(3) "BIT" refcount(1) string(3) "BIT" refcount(1)
Output for hhvm-3.10.0 - 3.12.0
string(3) "BIT" refcount(1) Warning: debug_zval_dump() expects exactly 1 parameter, 2 given in /in/bCKs3 on line 7
Output for 4.3.0 - 5.6.28
string(3) "BIT" refcount(2) string(3) "BIT" refcount(4) string(3) "BIT" refcount(4)