(PHP 4 >= 4.2.0, PHP 5, PHP 7)
openssl_pkey_get_public — Extract public key from certificate and prepare it for use
openssl_pkey_get_public ( mixed $certificate ) : resource
openssl_pkey_get_public() extracts the public key from certificate
and prepares it for use by other functions.
certificate
certificate
can be one of the following:
Returns a positive key resource identifier on success, or false
on error.
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https://www.php.net/manual/en/function.openssl-pkey-get-public.php