[Solved] How to interleavedly duplicate an array in php?

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Looks like a reasonably simple reduction (using array_reduce())

$x = array_reduce($x, function($arr, $val) {
    array_push($arr, $val, $val);
    return $arr;
}, []);

Demo ~ https://3v4l.org/eNH8a

Just realised that “reduction” sounds a bit funny since we’re making the array bigger. Think of it more as a transformation. See https://en.wikipedia.org/wiki/Reduce_(parallel_pattern)

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solved How to interleavedly duplicate an array in php?