2

From How can I make this PHP merkle root script recursive?

function binFlipByteOrder($string) {
    return implode('', array_reverse(str_split($string, 1)));
}

Why a flip?

3

Hashes are big endian by standard, and most computers use little endian, so it's probably just for convenience. See Why does the Bitcoin protocol use the little-endian notation?

  • Ok thanks you! (I suspected the Lilliputians..) – Nicolas Cantu Nov 26 '18 at 15:37
  • haha they are alive and well in Bitcoin... :) – JBaczuk Nov 26 '18 at 15:37
  • Of course it's a little big part of Internet (Cohen) and a community story :) So they are well in Bitcoin :) – Nicolas Cantu Nov 27 '18 at 0:26

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