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run code in 150+ php & hhvm versions
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<?php $a = 2; $b= 3; $c = 56; $v = array($a, $b,$c); print_r($v); unset($a); print_r($v);
Output for 4.3.0 - 7.1.0
Array ( [0] => 2 [1] => 3 [2] => 56 ) Array ( [0] => 2 [1] => 3 [2] => 56 )