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PHP - convert little endian hex to big endian hex

I am trying to convert little endian hex to big endian hex.

Example:

Little endian: E1 31 01 00 00 9D

Big endian: 9D 00 00 01 31 E1

Solution

  • If numbers are in the format described than you can convert by using standard array functions.

    function littleToBigEndian($little) {
  return implode(' ',array_reverse(explode(' ', $little)));
}

echo littleToBigEndian('E1 31 3C 01 00 00 9B');
// Output: 9B 00 00 01 3C 31 E1

    If there are no spaces for separation of numbers you need to str_split() the string instead.

    function littleToBigEndian($little) {
  return implode('',array_reverse(str_split($little,2)));
}

echo littleToBigEndian('E1313C0100009B');
// Output: 9B0000013C31E1