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run code in 150+ php & hhvm versions
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<?php $array = array(1 => 0, 2, 3, 4); print_r($array); array_splice($array, 1, count($array)); print_r($array); ?>
Output for 4.3.0 - 7.1.0
Array ( [1] => 0 [2] => 2 [3] => 3 [4] => 4 ) Array ( [0] => 0 )