How to get all comments from a Youtube video - php

Question

Firstly, I looked all of other title. All of them out of date. I mean, they are use old api.
I write a code to list all comments with their nextPageToken
<?php
$url = "SE0wDh_pILk"; // Youtube video ID
$ytkey = "IzaSyCaRXmJ9XDC4XucAZCzXx7hisCtYEH0mNs"; //"IzaSyBuu-rnbmPAj1DjR6WmyxGmpmQKz8aTXbw" Your api key
$nextPage = ""; // Next Page Token for get comments of next Page.
//$i =0; // DO NOT CHANGE
for ($i = 0; $i < 5; $i++) {
$str = file_get_contents("https://www.googleapis.com/youtube/v3/commentThreads?key=" . "$ytkey" . "&textFormat=plainText&part=snippet&videoId=" . "$url" . "&maxResults=100&nextPagetoken=" . "$nextPage");
$json = json_decode($str, true); // decode the JSON into an associative array
//echo '<pre>' . print_r($json, true) . '</pre>'; // Print json data as array structer ..
echo "$i - " . "Next Page Token : " . $json['nextPageToken']; // Take the next Page Token for get next 100 comment...
echo "<hr>"; // Divider
$nextPage = $json['nextPageToken']; // Take token for next query
// print comments.
foreach ($json['items'] as $val) { // Loop for list comments...
$author = $val['snippet']['topLevelComment']['snippet']['authorDisplayName']; //Get Comment Author Name.
//$author_url = $val['snippet']['topLevelComment']['snippet']['authorChannelUrl']; //Get Comment Author URL.
//$author_thumbnail_url = $val['snippet']['topLevelComment']['snippet']['authorProfileImageUrl']; //Get Comment Author Thumbnail URL.
$comment = $val['snippet']['topLevelComment']['snippet']['textDisplay']; //Get Comment Content.
echo "<span style='color:red';>" . "$author" . "</span>" . " --> " . "$comment"; // Author and comment
echo "<hr>"; // Divider
}
}
echo "Process over. ";
?>
I learn how to parse json and how to show them on php from stackoverflow.
Now, there is no problem with taking nextPageTokens. But I can't get comments.
When I run the script, It returns different nextPageToken but comments are same, they come from the first page.
I try to add enough comment line.
Sorry I can't color the php codes.

Answer 1

You are calling commentThreads with the parameter &nextPagetoken=.
The correct parameter to use is &pageToken=.

Answer 2

Here is a recursive,bare bones function to return all comments from a video
public function getAllComments($videoId,$pageToken=null,$maxResults){
$url = "https://www.googleapis.com/youtube/v3/commentThreads";
static $all =[];
$params =[
'key' => 'your-key',
'part' => 'snippet',
'maxResults' => $maxResults,
'videoId' => $videoId,
'pageToken' => $pageToken
];
$call = $url.'?'.http_build_query($params);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $call);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
$data = NULL;
$data = json_decode($output,true);
$all[] = $data;
if(isset($data['nextPageToken'])){
if($data['nextPageToken'] != NULL ){
$pageToken = $data['nextPageToken'];
getAllComments($videoId,$pageToken,$maxResults);
}
}
curl_close($ch);
return $all;
}

Answer 3

Finally I found a site that does what I want to do.
If you have to collect all comments of a video and take one of them randomly for lottery etc. , use these sites ->
https://www.randomcommentpicker.com
http://commentpicker.com/youtube.html