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run code in 150+ php & hhvm versions
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<?php echo serialize(array('pl','en','it','de','ro', 'ru'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
a:6:{i:0;s:2:"pl";i:1;s:2:"en";i:2;s:2:"it";i:3;s:2:"de";i:4;s:2:"ro";i:5;s:2:"ru";}