youtube class video limit not working - php

Question

I want to change the video limit on my home page (getpopularvideos), but when I change the limit, it always only shows 20 videos.
What am I doing wrong?
protected function getPopularVideos($limit = NULL){
// Set Limit
if(!is_null($limit)) $this->limit = $limit;
// Construct URL
$part = "snippet,contentDetails,statistics";
$this->url = "https://www.googleapis.com/youtube/v3/videos?key={$this->key}&part=$part&chart=mostPopular&maxResults={$this->limit}";
if(!is_null($this->page)) $this->url = $this->url."&pageToken={$this->page}";
// Get Data
$data = Main::cache_get("popular_{$this->page}");
if($data == NULL){
$data = $this->http(TRUE);
Main::cache_set("popular_{$this->page}", $data); $limit = 24;
}
$i = 1;
$html = "<ul class='media'>";
foreach ($data->items as $yt) {
$html .= $this->listVideo($yt);
if($i%24 == 0) {
$html .= "</ul>{$this->ads(728)}<ul class='media'>";
}
$i ++;
}
$html .= "</ul>";
$this->pagination = "<ul class='list-inline'>";
if(isset($data->prevPageToken)){
$this->pagination .= "<li ><a href='{$this->config["url"]}/popular/{$data->prevPageToken}' class='btn btn-ghost'><i class='btn-icon btn-icon--left ninety9lives-youtube-play'></i> Previous</a></li>";
}
if(isset($data->nextPageToken)){
$this->pagination .= "<li ><a href='{$this->config["url"]}/popular/{$data->nextPageToken}' class='btn btn-ghost'><i class='btn-icon btn-icon--left ninety9lives-youtube-play'></i> Next</a></li>";
}
$this->pagination .= "</ul>";
return $html;
}
protected function getUserVideos4Home($q, $limit = NULL){
if(!is_null($limit)) $this->limit = $limit;
$part = "snippet";
$this->url = "https://www.googleapis.com/youtube/v3/search?key={$this->key}&part=$part&order=date&type=video&channelId={$q}&maxResults={$this->limit}";
if(!is_null($this->page)) $this->url = $this->url."&pageToken={$this->page}";
$data = $this->http(TRUE);
$i = 1;
$return = new stdClass();
$return->title = $data->items[0]->snippet->channelTitle;
$html .= "";
$vids = array();
foreach ($data->items as $yt){
$vids[] = $yt->id->videoId;
}
$videos2 = implode(",", $vids);
$part = "snippet,contentDetails,statistics";
$this->url = "https://www.googleapis.com/youtube/v3/videos?key={$this->key}&part={$part}&id={$videos2}";
$data2 = $this->http(TRUE);
$durations = Main::durations($vids);
foreach ($data->items as $yt) {
$html .= $this->listSearchVideo12($yt,$durations[$yt->id->videoId]);
if($i%6 == 0) {
$html .= "</div><div class='adblock'><div class='img'>Google AdSense<br>336 x 280</div></div><div class='list'>";
}
$i ++;
}
$html .= "";
return $html;
}