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<?php $f=fn($a,$f)=>$a?array_merge(array_shift($a),$f(array_reverse($a?next($a)?array_map(null,...$a):array_chunk($a[0],1):$a),$f)):$a; print_r( $f([[1, 2, 3, 4], [12, 13, 14, 5], [11, 16, 15, 6], [10, 9, 8, 7]], $f) );
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 [9] => 10 [10] => 11 [11] => 12 [12] => 13 [13] => 14 [14] => 15 [15] => 16 )

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