What is the most convenient hashing method to be used to hash passwords

It is preferable to use crypt() which natively supports several hashing algorithms or the function hash() which supports more variants than crypt() rather than using the common hashing algorithms such as md5, sha1 or sha256 because they are conceived to be fast. hence, hashing passwords with these algorithms can vulnerability

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PrestaShop 1.6 How to add a discount to order?

$cart_rule = new CartRule();
$cart_rule->id_customer = $this->context->cart->id_customer;
$cart_rule->name = array(
    Configuration::get('PS_LANG_DEFAULT') => $this->l('CartRule title')
);
$cart_rule->date_from = date('Y-m-d H:i:s', time());
$cart_rule->date_to = date('Y-m-d H:i:s', time() + 24 * 3600);
$cart_rule->quantity = 1;
$cart_rule->quantity_per_user = 1;
$cart_rule->minimum_amount_currency = $this->context->cart->id_currency;
$cart_rule->reduction_currency = $this->context->cart->id_currency;
$cart_rule->free_shipping = true;
$cart_rule->reduction_amount = 50; #discount value
$cart_rule->active = 1;
$cart_rule->add();

// Add cart rule to cart and in order
$values = array(
    'tax_incl' => $cart_rule->getContextualValue(true),
    'tax_excl' => $cart_rule->getContextualValue(false)
);
$this->context->cart->addCartRule($cart_rule->id, $cart_rule->name[Configuration::get('PS_LANG_DEFAULT')], $values);