Get supported features in JSON format

# rnp_supported_features

(PECL rnp >= 0.1.1)

rnp_supported_features — Get supported features in JSON format

### 说明

function rnp_supported_features(string `$type`): string|false

Get the JSON formatted string containing array of supported rnp feature values (algorithms, curves, etc) by type.

### 参数

`type`
  See RNP_FEATURE_* constants for supported values.

### 返回值

String containing JSON formatted array of supported algorithms, curves, etc 或者在失败时返回 `false`.

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