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run code in 200+ php & hhvm versions
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<?php $var = "laruence"; $var_dup = $var; unset($var); debug_zval_dump($var_dup);
based on GJdFs
Output for hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.1.1, 7.1.7 - 7.2.4
string(8) "laruence" refcount(1)
Output for 7.1.2 - 7.1.6
string(8) "laruence" refcount(3)
Output for 5.5.0 - 5.6.30
string(8) "laruence" refcount(2)