<?php

// encryption with phpseclib - PHP Secure Communications Library

use phpseclib\Crypt\Blowfish;

$blowfish = new Blowfish();

$blowfish->setKey('48495774373859848594959');

$plaintext = 'My plaintext string';

$encrypted = $blowfish->encrypt($plaintext);
$decrypted = $blowfish->decrypt($encrypted);

var_dump($encrypted, $decrypted);

string(24) "È”X"˜[ßàÝE9@© éÃIÎ#Wp"
string(19) "My plaintext string"

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PHP 7.2, Zend 3.0, Symfony 4.0, Laravel 5.6, PHPUnit 6.5, Doctrine 2.8