Getting wrong number of results in youtube API php - php

Question

I am trying to fetch videos from youtube using below code:
$youtube_api_url = "https://www.googleapis.com/youtube/v3/search?key=".$new_key->api_key;
$youtube_api_url = $youtube_api_url."&order=relevance&type=video&maxResults=20&part=snippet&videoCategoryId=10&q=". urlencode(preg_replace('/[^a-zA-Z0-9_ %\[\]\.\(\)%&-]/s', '',$trackRecord->name));
$ch = curl_init();
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Accept: application/json'));
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_URL,$youtube_api_url);
$result=curl_exec($ch);
$response = json_decode($result, true);
echo "<pre>"; print_r($response); die;
It is returning wrong number of results as below:
Array
(
[items] => Array
(
[0] => Array
(
[kind] => youtube#searchResult
[etag] => "m2yskBQFythfE4irbTIeOgYYfBU/ne5AZXpdoLtAn-mlwu4ipioOQ_I"
[id] => Array
(
[kind] => youtube#video
[videoId] => dB0ITzfbwfw
)
[snippet] => Array
(
[publishedAt] => 2017-01-23T17:31:23.000Z
[channelId] => UCdW5nPo1oyD2vLkvoYijmEg
[title] => Lihtz Kamraz "The Switch Up" Interview Part 2
[description] => In 2016, a lot of break out artists emerged and made a mark in the game. As 2017 begins, one name that you should definitely be on the lookout for is Lihtz ...
[thumbnails] => Array
(
[default] => Array
(
[url] => https://i.ytimg.com/vi/dB0ITzfbwfw/default.jpg
[width] => 120
[height] => 90
)
[medium] => Array
(
[url] => https://i.ytimg.com/vi/dB0ITzfbwfw/mqdefault.jpg
[width] => 320
[height] => 180
)
[high] => Array
(
[url] => https://i.ytimg.com/vi/dB0ITzfbwfw/hqdefault.jpg
[width] => 480
[height] => 360
)
)
[channelTitle] => HIPHOPSINCE1987TV
[liveBroadcastContent] => none
)
)
)
)
As you can see it is showing total and per page result as:
[pageInfo] => Array
(
[totalResults] => 14
[resultsPerPage] => 20
)
How can I get all results?