Convert associative array into a query string

querystring.php

<?php

$params = array(
    'query' => 'something',
    'page' => 1,
    'items' => 10
);

$url = 'http://someapi.com/search';

if (count($params) > 0) {
    $url .= '?' . implode('&', array_map(function($item) {
        return $item[0] . '=' . $item[1];
    }, array_map(null, array_keys($params), $params)));
}

echo $url; // http://someapi.com/search?query=something&page=1&items=10

?>