function UrlHelper::buildQuery

Parses an array into a valid query string encoded with rawurlencode().

Function rawurlencode() is RFC3986 compliant, and as a consequence RFC3987 compliant. The latter defines the required format of "URLs" in HTML5. urlencode() is almost the same as rawurlencode(), except that it encodes spaces as "+" instead of "%20". This makes its result non compliant to RFC3986 and as a consequence non compliant to RFC3987 and as a consequence not valid as a "URL" in HTML5.

Parameters

array $query: The query parameter array to be processed; for instance, \Drupal::request()->query->all().

string $parent: (optional) Internal use only. Used to build the $query array key for nested items. Defaults to an empty string.

Return value

string A string encoded with rawurlencode() which can be used as or appended to the URL query string.

File

core/lib/Drupal/Component/Utility/UrlHelper.php, line 42

Class

UrlHelper: Helper class URL based methods.

Namespace

Drupal\Component\Utility

Code

public static function buildQuery(array $query, $parent = '') {
    $params = [];
    foreach ($query as $key => $value) {
        $key = $parent ? $parent . rawurlencode('[' . $key . ']') : rawurlencode($key);
        // Recurse into children.
        if (is_array($value)) {
            $params[] = static::buildQuery($value, $key);
        }
        elseif (!isset($value)) {
            $params[] = $key;
        }
        else {
            // For better readability of paths in query strings, we decode slashes.
            $params[] = $key . '=' . str_replace('%2F', '/', rawurlencode($value));
        }
    }
    return implode('&', $params);
}