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run code in 150+ php & hhvm versions
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<?php $a = array( null => 'great', TRUE => TRUE, FALSE => FALSE, true => TRUE ); print_r($a); count($a);
Output for 4.3.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [] => great [1] => 1 [0] => )
Output for 4.3.0 - 4.3.1
Array ( [] => great )