3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $opt_dupa = 'a'; $o['dupa'] = 'b'; extract((array) $o, EXTR_IF_EXISTS, 'opt'); var_dump($opt_dupa);
based on j1CSu
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(1) "a"