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run code in 150+ php & hhvm versions
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<?php $arr = array ( 0 => array ( 10 => 1, 12 => 2 ) ); var_dump(current($arr[0])); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1)