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run code in 150+ php & hhvm versions
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<?php var_dump(unserialize('a:2:{i:0;a:1:{s:11:"Environment";s:8:"TERMINAL";}i:1;a:1:{s:11:"Environment";s:6:"SERVER";}}'));
based on v2ZI3
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> array(1) { ["Environment"]=> string(8) "TERMINAL" } [1]=> array(1) { ["Environment"]=> string(6) "SERVER" } }
Output for hhvm-3.10.0

Process exited with code 153.