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<?php $arr = array(); $arr[] = array(1 => array(2 => '', 3 => array(4, 5)), 6); echo('<pre>'); print_r($arr); echo('</pre>');
Output for 4.3.0 - 7.1.0
<pre>Array ( [0] => Array ( [1] => Array ( [2] => [3] => Array ( [0] => 4 [1] => 5 ) ) [2] => 6 ) ) </pre>