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

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

public_key

public_key can be one of the following:

an OpenSSLAsymmetricKey instance
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).
A PEM formatted public key.

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

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.