PHP byte array to hex, hex to byte array, string to hex, hex to string utility functions

util.php

<?php

function string2ByteArray($string) {
  return unpack('C*', $string);
}

function byteArray2String($byteArray) {
  $chars = array_map("chr", $byteArray);
  return join($chars);
}

function byteArray2Hex($byteArray) {
  $chars = array_map("chr", $byteArray);
  $bin = join($chars);
  return bin2hex($bin);
}

function hex2ByteArray($hexString) {
  $string = hex2bin($hexString);
  return unpack('C*', $string);
}

function string2Hex($string) {
  return bin2hex($string);
}

function hex2String($hexString) {
  return hex2bin($hexString);
}

?>

util_test.php

<?php

include('./util.php');

$byteArray = unpack('C*', 'hello');
assert(string2ByteArray('hello') == $byteArray);
assert(byteArray2String($byteArray) == 'hello');

assert(byteArray2Hex($byteArray) == '68656c6c6f');
assert(hex2ByteArray('68656c6c6f') == $byteArray);

assert(string2Hex('hello') == '68656c6c6f');
assert(hex2String('68656c6c6f') == 'hello');

?>

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