# sodium_hex2bin

(PHP 7 >= 7.2.0)

sodium_hex2bin — Decodes a hexadecimally encoded binary string

### 说明

sodium_hex2bin ( string `$hex` [, string `$ignore` ] ) : string

Decodes a hexadecimally encoded binary string.

Like sodium_bin2hex(), sodium_hex2bin() is resistant to side-channel attacks while hex2bin() is not.

### 参数

`hex`

  Hexadecimal representation of data.

`ignore`

  Optional string argument for characters to ignore.

### 返回值

Returns the binary representation of the given `hex` data.