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run code in 150+ php & hhvm versions
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<?php $A = array(); $B = &$A[0]; $F = &$A[1]; $C = $A; $D = $A; $C[0] = $D[1]; debug_zval_dump($A); debug_zval_dump($C); debug_zval_dump($D); $C[0] = 10; $D[1] = 20; echo $A[0] . ' ' . $A[1];
Output for 7.0.0 - 7.1.0
array(2) refcount(3){ [0]=> &NULL [1]=> &NULL } array(2) refcount(2){ [0]=> &NULL [1]=> &NULL } array(2) refcount(3){ [0]=> &NULL [1]=> &NULL } 10 20
Output for hhvm-3.12.0
array(2) refcount(3){ [0]=> NULL refcount(3) [1]=> NULL refcount(3) } array(2) refcount(2){ [0]=> NULL refcount(3) [1]=> NULL refcount(3) } array(2) refcount(3){ [0]=> NULL refcount(3) [1]=> NULL refcount(3) } 10 20
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.6.28
array(2) refcount(3){ [0]=> &NULL refcount(3) [1]=> &NULL refcount(3) } array(2) refcount(2){ [0]=> &NULL refcount(3) [1]=> &NULL refcount(3) } array(2) refcount(3){ [0]=> &NULL refcount(3) [1]=> &NULL refcount(3) } 10 20