<?php
function generate_whatsapp_link() {
    // Check if the "ref" cookie exists and is not empty.
    if (isset($_COOKIE['ref']) && !empty($_COOKIE['ref'])) {
        // Get the value of the "ref" cookie and sanitize it for use in the URL.
        $ref_value = urlencode($_COOKIE['ref']);

        // Replace 'your_whatsapp_number_here' with your actual WhatsApp number.
        $whatsapp_number = '40757885888';

        // Set the additional message for the "text" parameter.
        $additional_message = 'Buna ziua! Sunt interesat de ';

        // Construct the link text with the WhatsApp number, "(ref={ref value})", and the additional message.
        $link_text = 'https://wa.me/' . $whatsapp_number . '?text=' . urlencode('(REF ' . $ref_value . ') ' . $additional_message);

        return $link_text;
    } else {
        // If the "ref" cookie is not set or empty, return a default link text without the "ref" value.
        // Replace 'your_whatsapp_number_here' with your actual WhatsApp number.
        $whatsapp_number = '40757885888';

        // Set the additional message for the "text" parameter.
        $additional_message = 'Buna ziua! Sunt interesat de ';

        // Construct the link text with only the WhatsApp number and the additional message.
        $link_text = 'https://wa.me/' . $whatsapp_number . '?text=' . urlencode($additional_message);

        return $link_text;
    }
}
?>