'.$key.''; //Generate private/public keypair using openssl functions $key = openssl_pkey_new([ 'digest_alg' => 'sha512', 'private_key_bits' => 2048, 'private_key_type' => OPENSSL_KEYTYPE_RSA, ]); // export private key openssl_pkey_export($key, $priv_key); // export public key $keyData = openssl_pkey_get_details($key); $public_key = $keyData['key']; $private_key = $priv_key; echo ''.$public_key.''; echo ''.$private_key.''; ?>