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run code in 200+ php & hhvm versions
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<?php $a = 'foo'; $b = & $a; $c = 'moo'; $vars = get_defined_vars(); $vars['a'] = 'OMG'; $vars['c'] = 'Pie'; var_dump($a, $b, $c, debug_zval_dump($a), debug_zval_dump($b), debug_zval_dump($c));
Output for 7.0.0 - 7.1.0, 7.1.7 - 7.2.0
string(3) "OMG" refcount(1) string(3) "OMG" refcount(1) string(3) "moo" refcount(1) string(3) "OMG" string(3) "OMG" string(3) "moo" NULL NULL NULL
Output for 7.1.5 - 7.1.6
string(3) "OMG" refcount(5) string(3) "OMG" refcount(5) string(3) "moo" refcount(4) string(3) "OMG" string(3) "OMG" string(3) "moo" NULL NULL NULL
Output for 4.3.0 - 5.6.28
string(3) "OMG" refcount(1) string(3) "OMG" refcount(1) string(3) "moo" refcount(3) string(3) "OMG" string(3) "OMG" string(3) "moo" NULL NULL NULL