youtube_transcript_example.php

<?php

// Example usage of YouTube Transcript API equivalent in PHP
// This uses the Google YouTube Data API v3 via the Google PHP Client Library.
// First, install it: composer require google/apiclient
// Obtain a YouTube API key from the Google Developer Console.

require 'vendor/autoload.php';

use Google_Client;
use Google_Service_YouTube;

$client = new Google_Client();
$client->setDeveloperKey('YOUR_YOUTUBE_API_KEY_HERE');  // Replace with your actual API key
$youtube = new Google_Service_YouTube($client);

$videoId = 'exampleVideoIdHere';  // Replace with a real video ID, e.g., 'dQw4w9WgXcQ'

try {
    $captionsResponse = $youtube->captions->listCaptions('id,snippet', $videoId);
    
    if (!empty($captionsResponse['items'])) {
        foreach ($captionsResponse['items'] as $item) {
            $captionId = $item['id'];
            $captionDownloadUrl = $youtube->captions->download($captionId, array('tfmt' => 'sbv'));  // Download as SubViewer format, for example
            $transcriptContent = file_get_contents($captionDownloadUrl);  // Fetch the content
            echo "Transcript for caption ID $captionId:\n" . $transcriptContent . "\n";
        }
    } else {
        echo "No captions available for this video.\n";
    }
} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
}

// End of script
?>