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run code in 200+ php & hhvm versions
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<?php var_dump(unserialize('a:2:{i:0;i:50;i:1;i:50;}'));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
array(2) { [0]=> int(50) [1]=> int(50) }