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run code in 150+ php & hhvm versions
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<?php print_r(unserialize('s:1:"4";')); print_r(unserialize('a:2:{s:16:"ERA/EMA Discount";i:50;s:27:"Early Registration Discount";i:50;}'));
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
4Array ( [ERA/EMA Discount] => 50 [Early Registration Discount] => 50 )
Output for hhvm-3.10.0

Process exited with code 153.