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run code in 150+ php & hhvm versions
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<?php $x = implode(', ', array_slice(array('USA'), -2)); var_dump($x);
based on Q5dmX
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(3) "USA"