PHP 将字节转换为字节数组

Question

My code receive some json with a byte field like 48656C6C6F ,and I'm trying to convert it to a byte pairs in array like array[0] = 48, array[1]=65 ... in order to work with each byte.

Actually, I've made this bypass function in order to have the array:

function Array_conv($hex){
    $chunks = str_split($hex, 2);
    $result = implode(',', $chunks);
    return $result;
}

The question is, have a right way to convert to a byte array, or to hex like 0x48..

Thanks!

Answer 1

Strings in PHP are just as well suited to access every single byte as arrays.

$hex = "48656C6C6F";
$string = hex2bin($hex);
var_dump($string);  //string(5) "Hello"

The function strlen() returns the length in Byte. With a simple for loop you can get every Byte. With ord() you get the byte as an unsigned integer between 0 and 255.

$byteLen = strlen($string);
for($i=0; $i < $byteLen; $i++){
  $byte = $string[$i];
  echo ord($byte).",";
}

Output:

72,101,108,108,111,