How to make a link in curl in parts?

Question

PHP

There is curl code

if (!empty($_POST)) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'http://site.ru/kontact');
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

How can I split the code into parts like this

if (!empty($_POST)) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'http://site.ru/'     'kontact');
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

To work?

Answer 1

curl_setopt($ch, CURLOPT_URL, 'http://site.ru/' .    'kontact');