Source of html.inc.php - Zabbix

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    return $result;
}
​
/**
 * Get ready for url params.
 *
 * @param mixed       $param           Param name or array with data depends from $getFromRequest.
 * @param bool        $getFromRequest  Detect data source - input array or $_REQUEST variable.
 * @param string|null $name            If $_REQUEST variable is used this variable not used.
 */
function url_param($param, bool $getFromRequest = true, string $name = null): string {
function url_param($param, bool $getFromRequest = true, ?string $name = null): string {
    if (is_array($param)) {
        if ($getFromRequest) {
            fatal_error(_('URL parameter cannot be array.'));
        }
    }
    elseif ($name === null) {
        if (!$getFromRequest) {
            fatal_error(_('URL parameter name is empty.'));
        }
​
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}
​
/**
 * Renders a form footer with the given buttons.
 *
 * @param CButtonInterface|null $main_button  Main button that will be displayed on the left.
 * @param CButtonInterface[]    $other_buttons
 *
 * @throws InvalidArgumentException if an element of $other_buttons contain something other than CButtonInterface
 */
function makeFormFooter(CButtonInterface $main_button = null, array $other_buttons = []): CList {
function makeFormFooter(?CButtonInterface $main_button = null, array $other_buttons = []): CList {
    foreach ($other_buttons as $other_button) {
        $other_button->addClass(ZBX_STYLE_BTN_ALT);
    }
​
    if ($main_button !== null) {
        array_unshift($other_buttons, $main_button);
    }
​
    return (new CList())
        ->addClass(ZBX_STYLE_TABLE_FORMS)