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run code in 150+ php & hhvm versions
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<?php print_r(unserialize('a:1:{s:5:"title";a:2:{s:3:"mul";s:4:"Home";s:2:"de";s:4:"Home";}}')); echo serialize(array('title' => array('en' => 'Home', 'de' => 'Heim', 'mul' => 'Home')));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [title] => Array ( [mul] => Home [de] => Home ) ) a:1:{s:5:"title";a:3:{s:2:"en";s:4:"Home";s:2:"de";s:4:"Heim";s:3:"mul";s:4:"Home";}}