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<?php $a = array(); $a[10][20][30] = 102030; echo '<pre>'; print_r($a); echo '</pre>';
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<pre>Array ( [10] => Array ( [20] => Array ( [30] => 102030 ) ) ) </pre>