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run code in 150+ php & hhvm versions
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<?php $arr = array( array("item_data"=>array(1,2,3)), array("item_data"=>array(4,5,6)), array("item_data"=>array(7,8,9)) ); print_r($arr);
based on uL6cS
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [item_data] => Array ( [0] => 1 [1] => 2 [2] => 3 ) ) [1] => Array ( [item_data] => Array ( [0] => 4 [1] => 5 [2] => 6 ) ) [2] => Array ( [item_data] => Array ( [0] => 7 [1] => 8 [2] => 9 ) ) )