问我怎样才能让一个函数在找到所有信息之前一直重复执行？

EN

function spider($urltospider, $current_array = array(), $ignore_array = array('')) {
    if(empty($current_array)) {
        // Make the request to the original URL
        $session = curl_init($urltospider);
        curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
        $html = curl_exec($session);
        curl_close($session);
        if($html != '') {
            $dom = new DOMDocument();
            @$dom->loadHTML($html);
            $xpath = new DOMXPath($dom);
            $hrefs = $xpath->evaluate("/html/body//a");
            for($i = 0; $i < $hrefs->length; $i++) {
                $href = $hrefs->item($i);
                $url = $href->getAttribute('href');
                if(!in_array($url, $ignore_array) && !in_array($url, $current_array)) {
                    // Add this URL to the current spider array
                    $current_array[] = $url;
                }
            }               
        } else {
            die('Failed connection to the URL');
        }
    } else {
        // There are already URLs in the current array
        foreach($current_array as $url) {
            // Connect to this URL

            // Find all the links in this URL

            // Go through each URL and get more links
        }
    }
}