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run code in 150+ php & hhvm versions
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<?php // $opt_dupa = 'a'; $o['dupa'] = 'b'; extract((array) $o, EXTR_PREFIX_ALL , 'opt_'); var_dump($opt_dupa);
based on n0B5b
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: opt_dupa in /in/1IFIA on line 5 NULL
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: opt_dupa in /in/1IFIA on line 5 NULL