Frees a private key

# openssl_pkey_free

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

openssl_pkey_free — Frees a private key

Warning

This function has been DEPRECATED as of PHP 8.0.0. Relying on this function is highly discouraged.

### Description

#[\Deprecated]
openssl_pkey_free(OpenSSLAsymmetricKey `$key`): void

> Note:

> This function has no effect. Prior to PHP 8.0.0, this function was used to close the resource.

This function frees a private key created by openssl_pkey_new().

### Parameters

`key`

  Resource holding the key.

### Return Values

No value is returned.

### Changelog

Version | Description
--- | ---
8.0.0 | This function is now deprecated as it doesn't have an effect anymore.
8.0.0 | `key` accepts an OpenSSLAsymmetricKey now; previously, a resource of type `OpenSSL key` was accepted.

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