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<?php $arr = array( array("item_data"=>array(1,2,3)), array("item_data"=>array(4,5,6)), array("item_data"=>array(7,8,9)) ); var_dump($arr);die; function merge($prev, $now) { return array_merge($prev, $now['item_data']); } $res = array_reduce($arr, "merge", array()); print_r($res);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(1) { ["item_data"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } } [1]=> array(1) { ["item_data"]=> array(3) { [0]=> int(4) [1]=> int(5) [2]=> int(6) } } [2]=> array(1) { ["item_data"]=> array(3) { [0]=> int(7) [1]=> int(8) [2]=> int(9) } } }

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