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run code in 200+ php & hhvm versions
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<?php $str = 'a:1:{s:5:"param";s:28:"review/sendReviewSubmitEmail";}'; print_r(unserialize($str));
based on 60cru
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
Array ( [param] => review/sendReviewSubmitEmail )