markdown 在PHP中将字符串转换为十六进制

Posted 2021-05-06

## Setup

```
 $ php -a
Interactive mode enabled

php > $string = 'Hello world!';
php > $code = '48656c6c6f20776f726c6421';

```

## Encoding
```
php > /*/ The easy way /*/
php > var_dump(bin2hex($string));
string(24) "48656c6c6f20776f726c6421"

php > /*/ The engineer way /*/
php > var_dump(@reset(unpack('H*', $string)));
string(24) "48656c6c6f20776f726c6421"

php > /*/ The hard way /*/
php > var_dump(implode('', array_map(function ($character) {return base_convert(ord($character), 10, 16);}, str_split($string))));
string(24) "48656c6c6f20776f726c6421"

```

## Decoding
```
php > /*/ The easy way /*/
php > var_dump(hex2bin($code));
string(12) "Hello world!"

php > /*/ The engineer way /*/
php > var_dump(pack('H*', $code));
string(12) "Hello world!"

```