openssl_x509_check_private_key Checks if a private key corresponds to a certificate &reftitle.description; boolopenssl_x509_check_private_key mixedcert mixedkey Checks whether the given key is the private key that corresponds to cert. &reftitle.parameters; cert The certificate. key The private key. &reftitle.returnvalues; Returns &true; if key is the private key that corresponds to cert, or &false; otherwise.