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run code in 200+ php & hhvm versions
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<?php var_dump(unserialize("a:3:{i:0;i:1;i:0;i:2;i:2;i:3;}"));
based on 7iNpF
Output for 4.3.0 - 7.1.7
array(2) { [0]=> int(2) [2]=> int(3) }