openssl_pkey_get_public

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

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

resource openssl_pkey_get_public ( mixed $certificate )

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

certificate

certificate can be one of the following:

an X.509 certificate resource
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 a positive key resource identifier on success, or FALSE on error.