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run code in 150+ php & hhvm versions
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<?php $handlers = array( array('ids' => array(1, 2, 3)), array('ids' => array(4, 5, 6)), array('ids' => array(7, 8, 9)), ); $ids = array(); foreach ($handlers as $handler) { $ids += $handler['ids']; } var_dump($ids);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }