openssl_pkey_export_to_file

Supported Versions: PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8
Gets an exportable representation of a key into a file
openssl_pkey_export_to_file(¬†¬†¬†¬†OpenSSLAsymmetricKey|OpenSSLCertificate|array|string $key,¬†¬†¬†¬†string $output_filename,¬†¬†¬†¬†?string $passphrase null,¬†¬†¬†¬†?array $options null): bool