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run code in 200+ php & hhvm versions
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<?php echo serialize(['ARK31']);
based on 3qJIE
Output for 5.6.0 - 5.6.38, hhvm-3.18.4 - 3.22.0, 7.0.0 - 7.2.11
a:1:{i:0;s:5:"ARK31";}
Output for hhvm-3.15.4

Process exited with code 137.