3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 'x'; debug_zval_dump($a); b($a); function b($a){ debug_zval_dump($a); debug_zval_dump($a);//refcount=4 why not 3? }
Output for hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(1) "x" refcount(1) string(1) "x" refcount(1) string(1) "x" refcount(1)
Output for 4.3.0 - 5.6.28
string(1) "x" refcount(2) string(1) "x" refcount(4) string(1) "x" refcount(4)