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<?php $a=[]; $a[0]=[1,2,3]; $a[1]=[4,5,6]; $a[2]=[7,8,9]; $a[3]=[1,4,7]; $result = []; array_walk_recursive($a,function($val) use (&$result){ $result[] = $val; }); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
array(12) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) [7]=> int(8) [8]=> int(9) [9]=> int(1) [10]=> int(4) [11]=> int(7) }

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