# sodium_base642bin

(PHP 7 >= 7.2.0, PHP 8)

sodium_base642bin — Decodes a base64-encoded string into raw binary.

### 说明

sodium_base642bin(#[\SensitiveParameter] string `$string`, int `$id`, string `$ignore` = ""): string

Converts a base64 encoded string into raw binary. Unlike base64_decode(), sodium_base642bin() is constant-time (a property that is important for any code that touches cryptographic inputs, such as plaintexts or keys) and supports multiple character sets.

### 参数

`string`

  string; Encoded string.

`id`

  - `SODIUM_BASE64_VARIANT_ORIGINAL` for standard (`A-Za-z0-9/\+`) Base64 encoding.
  - `SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING` for standard (`A-Za-z0-9/\+`) Base64 encoding, without `=` padding characters.
  - `SODIUM_BASE64_VARIANT_URLSAFE` for URL-safe (`A-Za-z0-9\-_`) Base64 encoding.
  - `SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING` for URL-safe (`A-Za-z0-9\-_`) Base64 encoding, without `=` padding characters.
`ignore`

  Characters to ignore when decoding (e.g. whitespace characters).

### 返回值

Decoded string.

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