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<openssl_pkey_export_to_fileopenssl_pkey_get_details>
^OpenSSL FunctionsLast updated: Mon, 26 Oct 2026

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(
    since: '8.0',
    message: 'as OpenSSLAsymmetricKey objects are freed automatically',
)]
function 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.

<openssl_pkey_export_to_fileopenssl_pkey_get_details>
^OpenSSL FunctionsLast updated: Mon, 26 Oct 2026