Extract public key from certificate and prepare it for use

# openssl_pkey_get_public

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

openssl_pkey_get_public — Extract public key from certificate and prepare it for use

### Description

openssl_pkey_get_public(OpenSSLAsymmetricKey|OpenSSLCertificate|array|string `$public_key`): OpenSSLAsymmetricKey|false

openssl_pkey_get_public() extracts the public key from `public_key` and prepares it for use by other functions.

### Parameters

`public_key`

  `public_key` can be one of the following:

  1. an OpenSSLAsymmetricKey instance
  2. a string having the format file://path/to/file.pem. The named file must contain a PEM encoded certificate/public key (it may contain both).
  3. A PEM formatted public key.

### Return Values

Returns an OpenSSLAsymmetricKey instance on success, or `false` on error.

### Changelog

Version | Description
--- | ---
8.0.0 | On success, this function returns an OpenSSLAsymmetricKey instance now; previously, a resource of type `OpenSSL key` was returned.
8.0.0 | `public_key` accepts an OpenSSLAsymmetricKey or OpenSSLCertificate instance now; previously, a resource of type `OpenSSL key` or `OpenSSL X.509` was accepted.

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