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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 'b'; var_dump(debug_zval_dump($a));
Output for 7.0.0 - 7.1.0, 7.1.7 - 7.1.10
string(1) "b" refcount(1) NULL
Output for 7.1.5 - 7.1.6
string(1) "b" refcount(3) NULL
Output for 4.3.0 - 5.6.28
string(1) "b" refcount(2) NULL