PHP pack() return warning and bad hex

Question

I have a key that I need to convert to HEX with pack ().

$key = "78787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878";
$keyBytes = pack('H*',$key);

But pack() return this:

p�������

I need this:

[0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38, 0x37, 0x38]

what am I doing wrong? I follow exactly the manual that I have at my disposal.

The manual clearly states that pack() returns a **string**, not an array. I [cannot reproduce it](https://eval.in/923267) anyway. — Álvaro González, Dec 21 '17 at 08:35
Possible duplicate of [String to byte array in php](https://stackoverflow.com/questions/885597/string-to-byte-array-in-php) — Robby Cornelissen, Dec 21 '17 at 08:37

PHP pack() return warning and bad hex

0 Answers0