Simple script to regenerate prestashop 1.7 keys for encryption etc... (increase security in case of duplicating prestashop instances).

regenerate_prestashop_1.7_keys.php

<?php
// Be sure you are at root directory


// Loading prestashop configuration
require __DIR__ . '/config/config.inc.php';

// Loading parameters array
$parameters = require __DIR__ . '/app/config/parameters.php';

// Setting new keys
$parameters['parameters']['new_cookie_key'] = PhpEncryption::createNewRandomKey();
$parameters['parameters']['cookie_key']     = Tools::passwdGen(64);
$parameters['parameters']['cookie_iv']      = Tools::passwdGen(32);
$parameters['parameters']['secret']         = Tools::passwdGen(64);

// Saving modified parameters
file_put_contents(
    __DIR__ . '/app/config/parameters.php', 
    '<?php return ' . var_export($parameters, true) . ';'
);

// Clearing cache
exec("rm -rf " . __DIR__ . '/var/cache/prod');
exec("rm -rf " . __DIR__ . '/var/cache/dev');